The tier list/ranking for all Tanks in COMPETITIVE! (No kiriko!)
To preface, I don’t think any Tank is S tier, Sombra being hard meta and nigh broken makes life too hard for every single one of them. Even the best ones run the risk of being solo hacked over and over and murdered.
A tier: D.va, Zarya
B tier: Winston, Sigma, Orisa
C tier: Rein, hog
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F tier: Junker Queen, Ball, Doomfist
#1 (TIE) ) D.va and Zarya have the best team utility and self sustain mix of any tank, being able to go on the offense and defense with the flick of a switch, having high damage stats to compliment the fast pace of the game and take duels as well as good synergy with most of the cast and amazing ultimates. They have their weaknesses of course, but every tank does rn really, and their strengths far outshine them. Zarya also having the only tank cleanse when Hack and Discord are dominating makes her especially amazing. Not a lot to say, except that Dva is a lot harder to play obviously, so use Zarya if you want to climb fast.
#2) Winston is a solid pick that trades damage and utility for staying power in a brawl that no other tank really has. His Bubble is the best shield right now with a good mix of health whilst having no openings (it’s a dome!) in a game that’s less direct and more three dimensional than ever. He can take space and HOLD it even against the toughest of pushers, his mobility is still crazy and primal is a great carry tool that can take out long range threats and enemy tanks alike. His new sniper laser can deal with pharah and snipers which is something the other tanks cannot do (and something even D.va struggles with now that she can’t just ditch the fight to chase the pharah!). He outputs a lot of pressure and is tanky on his own, he deals really well with the 2 broken anti tank tools: Hack and Discord, so he’s in a good spot. The reason he is in this spot is that he struggles to secure kills and he gets bullied by D.va and Reaper who will counter him hard, being able to not only chase him but out dps him and it’s something that neither Dva or Zarya have to worry about with their strong cooldowns and damage.
#3) Sigma is still the most flexible tank in the game bar none, threatening at all ranges and his barrier and succ being buffed as well as his one shot combo and hard cc being back… he’s pretty strong at clearing down whole lanes safely and is probably the only tank not annihilated by sombra since he’s never really in the thick of it for him to get exploded in milliseconds, his ultimate is a lot more vulnerable now though and maybe too slow compared to things like grav, and he’s not as self sufficient as Dva or Zar when it comes to his own defenses when succ isn’t up.
#4) Orisa is basically a weaker version of Zarya right now, she likes to brawl like zarya does, and yes she might be tankier in small bursts, and even make more explosive, quicker plays with javelin, but once her cooldowns are out (cooldowns which are still underwhelming and basically worse versions of both sigma rock, defense matrix, and zarya bubble) she struggles to stay in the fight due to her slowness, huge hitbox, and pathetic primary fire. If you miss your opening as Orisa, she’s going to get rolled, and if Sombra waits until you’ve already used fortify (or just chooses to hack you over and over because she just… can.) your HP and defenses will do you no good against that plus things like Zarya laser which already go through your spinning spear and discord which is ridiculously strong now that zen can keep it on the one tank all game and Orisa cannot reach him unlike Dva, or cleanse it like Zarya, or block it like Sigma. Her ultimate is… yeah. Very boom or bust and is just a riskier version of Grav. However she’s still far better than both of our next contenders….
((WARNING, FROM HERE ON OUT THERE’S A HUGE POWER GAP COMPARED TO THE PREVIOUS TANKS AND IT’S ONLY REALLY DOWNHILL, BLIZZARD, ALL THE FOLLOWING TANKS NEED HELP.))
#5) Reinhardt. Poor reinhardt. All these buffs and his greatest weakness is still the fact that he lost the only thing that made him good: Zarya.
His shield is not strong enough for how inflexible it is compared to Sigma’s who can also output crazy damage and contend with slippery and long range threats whilst holding it up. And his huge weakness window for when he swings can no longer be covered by Matrix or Bubble, Zenyatta will find his discord opening, and so will the snipers that will kill his whole team. And let’s not even talk about how useless he is against flankers, especially the best DPS: Sombra. She eats him alive, making his only utility be completely useless due to him having to turn around (leaving him exposed) to block hack or get repeatedly hacked so he becomes not only melee-locked but easily burstable. Firestrike is OK but a worse version of winston laser and easily countered by Dva and Zarya. And charge is still a suicide button especially with tanks having stronger cc and hack and discord and no zarya bubble… sad! At least his shield is still a good tool to hold space for a bit while his dps clean up and he’s a lot easier to play with than other tanks he can be a menace when he (finally) gets in your face (if your team has a lucio…)
Keep in mind that once Kiriko comes out she’ll be able to straight up cancel shatter entirely. But for now, it’s still a great ult, since shields are barely present and that’s what puts him above….
#6) Roadhog will completely hold a game hostage and dominate if the enemy has 0 coordination (or is playing the tanks below him on this list) and yes! He is hard to kill in a fight, harder than he should reasonably be. But if you have a half decent tank from the ones above him keeping him in check, or a Sombra, or an Ana (until Kiriko, that will be scary)… or a sniper… it’s not only easy to coordinate a focus fire to murder him, but to annihilate his entire team and THEN him. He still offers no utility and is super dependent on the enemy composition and ranked matchmaking and coordination being… well, you know. He drops off hard, and is easily abusable if even a single opponent chooses the right character, and as the meta develops and the game speeds up, he’ll quickly fall behind and return to being the low rank stomper only, he still has awful synergy with most dps too…
#7) Junker Queen is really, really underwhelming after her main utility was nerfed into the ground… however, her knife Gracie can do great cc work countering tanks like doom or wrecking ball which are domina— oh wait. Uh… well… it’s cool highlight material when you find kills with it!
But seriously, despite having good dueling potential against even things like Reaper that normally eat tanks alive… that’s really all Junker Queen has, and she’s being momentarily carried by a really good Ultimate (until Kiriko…), everywhere else, she gets stomped on by the tanks above, having little defenses against cc as well as her bleed heal being quite pathetic… even Reinhardt serves as a better rush fighter that can clean a point when he gets close. The Queen is all bark and no bite, flashy but lacking depth. She gets wrecked by Zen and Sombra, and just… most snipers due to her HP and lack of armor. She can find some value when you pump a Nano into her which is more than can be said for the tanks below her, but at that point just play Orisa or Zarya, no? At least if you’re good enough and literally never miss a headshot or knife you can get crucial picks, but so can roadhog, and she shares all his weaknesses… she needs buffs, Blizz.
#8) Do not be fooled by your weirdo games where no one picks to counter and let the rat do whatever he wants. Wrecking Ball is really bad. It’s crazy how even after so many of his counters were straight up removed, there’s still not only a whole cast of new CC (Javelin, good ‘ole Gracy, Pharah’s beefed up super boop, Brig shield boop, Zen kick…) there’s still a huge group of old CC to keep him down, and I mean DOWN. (Ana sleep, Brig flail, Reinhardt swinging in his general direction to kill his momentum, Doom punch, slam or ult, Roadhog hook, sigma rock, lucio boop, junk mines/trap, roadhog just solo ulting him to death, Hack, hack, hack, hack, hack, ha— oops! I got a little carried away there. 
)
Really, save even a single one of these for every engage swing or piledrive he has, and you’ve made him worthless for 5-8 seconds more as he rolls around waiting for his next (probably also cancellable) grapple whilst his team is murdered with no protection. Much like Reinhardt, Wrecking Ball thrived when a Dva and Zarya was there to cover for his weaknesses or simply distracted the enemy while he set up.
Now that he’s forced to be leashed to his team, which, anywhere under Masters will not know how to play with his set up playstyle and play like they have a shield and inevitably get picked off, his mobility doesn’t mean much as there’s no other tank to babysit while he annihilates the backline, not to mention his strongest counters (Sombra and Zen) got super-buffed, (Discord still untouched? Really?) and can not only keep him from playing, but in the case of sombra, be able to 1v1 him, which not even OW1 sombra was able to do. And she can make him visible through walls so his flanks are useless, and makes it so that no amount of buffed shields (which are still on a 12 second cooldown for some reason in a game where Zarya has 2 bubbles and he cannot afford that much downtime or his team is toast.) will save him.
Unfortunately for Ball, changing his playstyle to be a more straightforward diver just makes him fodder for even the tanks under him in this list, as well as just being a worse version of Dva and Winston that is also harder to play in every way. (They have better damage and range and staying power.) Zarya and Dva and Ana being really good means not even diving the snipers is a viable strategy as a well placed bubble or sleep or matrix destroys any engagement he may even want to take against the heroes he’s supposed to counter. On a lot of maps, enemy sojourns, hogs, or widows will have already found a pick before he can get to where he needs to be. His shields don’t even grant 0 ult energy anymore! He feeds with or without shields now! And his boop straight up got nerfed now that every tank has steadfast. Only reason he’s above doomfist is because he’s at least still fun to play when the enemy forgets to play a hero with CC, and at least he can live for a few seconds longer! 
) He needs help.
#9) Doomfist. Holy s*** what did they do?? Once upon a time back in OW2’s Beta I would have gone as far as to say he completely replaced Ball at his own job, but basically take everything that happened to Ball and multiply it by 3. PLUS they removed all his tech, his block is underwhelming, more predictable/counterable than piledrive, his damage is trash, and he does not provide value to his team either to make up for it. He needs to charge his punch for it to be usable and his slam is just a worse, unsafer Winston leap all the while he has no armor, lower HP and is worthless with the Sombras and Zenyatta’s crippling him and Orisa/Zarya ignoring him entirely. He’s boring, useless and a joke of a “Tank”/“Brawler”/whatever. I don’t even main him and he’s my least played tank by far but holy s*** I don’t understand how they thought this was OK. He fails at the most basic level of just… being able to fight a squishy 1v1… like what…?
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Anyway, that’s my list! Hope it helps… and if you read the whole thing, I really appreciate it and I hope to have your thoughts in the replies. OW2 is a ton of fun but balancing is… questionable but I hope Blizz can take a look at what’s struggling and make some fixes. Have a nice day everyone.