Demon hunter ez
I’ve played Guardian/Vengeance/Brewmaster and Protection Paladin. I can’t speak from experience for the others.
Easiest to play - Guardian Druid. Even your rotation is easy. Mitigation is Ironfur, stacking if need be. Plenty of others are close Brewmaster just merely pulling and keeping up drinks and Rushing Jade Wind is what you need for aggro.
Easiest to succeed in - Protection Paladin. You get so many safety buttons and plenty of interrupts that there’s a ton of leyway for things to fail and for you to still be alright.
If you’re going with a Guild and mainly dungeoning with them I would choose any of the three (especially with voice communication it’s easy). If you’re pugging randoms then Protection Paladin all the way.
Seconded. Thats exactly what I did when I ran Warrior.
It was so good I had a player report me for ‘cheating’ because I wasnt taking enough damage in his mind 
Guardian Bad? Uh hardly.
I wouldn’t describe any tank class as “complex”, they’re all pretty basic.
I wouldn’t suggest Warrior, personally, as some other posters have. Not because its complex, but because its the highest APM spec in the game, which isn’t exactly easy to keep up with.
Personally I’d suggest either Guardian or Brewmaster. Guardian because its incredibly simple, though it can be very boring as a result, and Brewmaster because its also pretty simple, and is basically impossible to mess up as long as you press your buttons.
Edit: Honorable mention to Vision of Perfection/Gluttony Vengeance DH, since its basically a one-button spec.
You could say the same about every tank class, and you can absolutely press your monk brew buttons in the wrong order.
Monk tanking from about 30-80 is rough, you start to really take lots of damage without the later passives, but it gets easier. By contrast warror, bear, paladin, and dk tanking is fine at that stage.
Sure, you could, but its especially egregious in the case of BrM. My post wasn’t entirely accurate, because honestly you can still do okay regardless of whether you press your buttons.
I also always assume context is max level. You can’t really make a judgment call based off of low level. Not when classes are missing half of their kits. Though admittedly, yes BrM does suffer a bit until then.
BrM suffers more than any other tank that is normally capable for queueing in that level range.
And you very much can get into trouble without purifying properly or keeping ironskin up at max level. The only way you could get away without using brews properly is if you outgear the content, but every tank has an easy time of it when they outgear the content.
They are all easy to play till a certain point in content. The hard part comes in when knowing all the extra stuff that tanks have to know…like the route (which isn’t hard at all once you do it a time or 2) Knowing what mobs to pull for each affix…like the slimes in yard will 1 shot you if they bolster or the screachers in AD if they bolster…how to drop the sang pools around the edges.
Other than that do a trial of all of them and play which ever one you enjoy best. I Enjoy DK then Pally…I don’t get any enjoyment from Veng DH and I main Blood. You’d think it was right up my ally.
Idk how there have been this many posts without more people saying bear. The hardest bit about bear is deciding ehst to watch on your second monitor.
You could do up to and beyond 15s literally macroing fur into every button and play with like 8 hot keys.
Thrash
Swipe
Frenzied regeneration
Maul (is that the builder?)
Iron bsck
Survival instincts
Taunt
Done.
Ignore pain is an absorb that only absorbs 50% of the damage that comes through. The other 50% hits you. And the absorb is small enough that if you have a pack of mages freecasting on you it will be extremely ineffective. Just try tanking SoS while only using ignore pain. You will flop extremely quickly on some of those packs there.
Hands down DH.
Is it viable?
Your rotation itself heals you.
Just keep spikes up and your good.
Probably paladin and dh. warr is definitely the most difficult.
Actually 100% not true, warrior requires actual brain power behind using their active cds. Ignore pain is not going to keep your block up when you got big hits coming.
Dk is super easy, vengeance pretty easy, brm is easy you literally have 100% defensive uptime, Pali requires some defensive uptime game play, and finally bear needs a little timing but can mostly spam
OP important tanking tip is don’t turn your back to mobs, a lot of new tanks don’t know about that.
I think you mean shield block.
I wish i could IP spam like it was legion
Prolly guardian druid or vengeance dh.
Only one i dont have experience on is brewmaster but Id imagine its not as beginner friendly.
I would consider prot pally but I cant figure out how to do good dmg unless I get td procs
As someone who plays every single tank spec at the +15 keystone level, the order of difficulty for tanks is, from easiest to hardest:
Guardian Druid
Protection Paladin
Blood Death Knight
Protection Warrior
Vengeance Demon Hunter
Brewmaster Monk.
So for you, I’d recommend either bear or prot pally.
ahahaha
I literally quit tanking and gave up at level 80 because I just seemed to get less and less survivable with each level
that explains a lot
Most people in here are going to say Warrior because they are the 1%'ers that watch the MDI.
As somebody who’s played Guardian for years and is in the process of switching over to Brewmaster, I think they’re about the same level of complexity.
But keep in mind that Brewmaster is getting buffed for Shadowlands and will be MUCH simpler to play than it is now, whereas Guardian is getting heavily nerfed in Shadowlands.