Gonna seperate this into three different categories, the good, middle of the pack, and bad, with that being said lets start:
The Good:
Sojourn: Definitely the strongest DPS from my experience, her kit is very versatile with her being able to take engagements at any range, good mobility that enables her to flank or simply reposition, and honestly disruptor shot is very versatile in it’s uses. Definitely overtuned tho.
Tracer: She got a DPS nerf but overall still insanely good, being able to harass the enemy backline, get a pick, and quickly get out will always be valuable and tracer is just always good at this.
Genji: For once Genji is finally good again with him being able to do his job without getting CC’d, what else more to say? Extremely mobile hero that is able to get into and out of backlines quickly and get picks. One of the best heroes currently in the game.
Hanzo: Again mainly the same except for a storm arrow nerf, IMO Hanzo is the hero who benefits the greatest from the 5v5 format. Very deadly at all ranges and IMO you can really never go wrong with picking him. Both Shimada bros are simply no laughing matter.
Soldier 76: Despite the nerfs to him he is still extremely good IMO, again less barriers in play so allows him to do more work and is all around a very safe pick mostly. He’s honestly the DPS that the game needs to be balanced around, he feels extremely balanced while being good.
Cassidy: Last of the heroes who left a strong impression on me, his magnetic grenade is arguably cheesey AF but overall he just plays so much better now compared to OW1, if you’re cracked with him you will dominate matches.
Middle of the pack
Widowmaker: I know she seems like she’s this god mode hero again but IMO she is very map specific and heavily countered by picks like tracer, sojourn, genji, Sombra, wrecking ball, D.va and winston. Benefits from 5v5 and can be very strong but not like omg she’s OP plz nerf.
Ashe: Still a good ranged DPS, again map specific like widow maker but still good, also benefits from 5v5 as well. BoB nerf is like whatever, she’s still great overall at what she does and doesn’t feel too strong or too weak but rather very well balanced.
Sombra: Her changes are good IMO, I felt myself getting more picks as her and actually felt impactful as DPS for a change, she’s more niche IMO but she makes a decent flanker that can disrupt the back line.
Echo: Got a lot of nerfs coming in from beta 1 but overall is a very mobile hero like pharah who has high killing potential but is shut down by hitscans quite easily. Also her ultimate is very feast or famine either you copy tracer get 2 pulse bombs or copy Reinhardt get focused and no ult at all.
Pharah: Overwatch’s premier aerial mobility hero, still good under the right conditions but again gets heavily countered by hit scan heroes and relies heavily on mercy.
Mei: No more freeze on primary fire but more DPS on primary fire and still slows so IMO she is a great brawler who is also good at punishing very mobile team compositions. Tho ranged heroes absolutely shut her down.
Junkrat: buff to his projectile size so king of bronze continues his reign. decent overall but man is it easy to just select heroes with range to counter him.
The Bad
Reaper: Reaper received two nerfs that have effectively made went from a decent brawler/flanker to an extremely inconsistent hero that does piss poor DPS outside of extreme close range. Overall he has an overreliance on Zarya and Lucio to even work now. He need’s buffs and maybe another ability, blizzard needs to look at him more like a flanker. Tho DPS nerf should stay he definitely needed that one and OTPs can cry about it.
Bastion: His changes are mostly great IMO and he does feel better overall but he’s gonna be making supports heal him a lot with that massive hitbox and no more self repair. Another thing I’d like to touch on is that his ult sucks, maybe they want you to combo it with grav or Orisa’s ult but overall you just move out of it’s way while it does literally nothing at all. That grenade do be good tho.
Torbjorn: The rivet gun buffs are very nice but honestly he suffers a lot from 5v5, I find that it’s so much easier to focus his turret without an extra tank around and sitting in the backline doesn’t cut it for him anymore plus overload lost armor so he’ll be easier to take out when he pops this ability.
Symmetra: Glorified TP bot lol, same as in OW1 but some small buffs, does not fit the fast paced gameplay of OW2.
And that’s about it, I didn’t go into my more intricate thoughts on why they’re good and kept it simple for the sake of the length of the thread and it’d take me maybe an hour or two do so. Hope this can at least be start a discussion that’d be nice to have.