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matchmaking sucks, you either rolled or get rolled no inbetween (i felt ow1 had better games overall)

I think matchmaking is only a little worse, but it feels a lot worse because OW2 is simultaneously more transparent and less transparent in the worst ways.

I think steamrolls happen at the same rate in either game, but in OW2 the detailed scoreboard makes it much more apparent when a steamroll is happening, since you can compare stats across both teams. OW1 just had personal stats, the vague medal system, and no enemy stats, so the only way to tell you were getting rolled is if you lost multiple team fights in a row.

On the other hand, not being able to see anyone's rank makes it much easier to blame losses on matchmaking. Also, the MMR system was a little fucky on launch with new players being placed higher than they should.

Tanks, which i main became such a chore, or just completely rolled due to skill differences

Yeah, tanking has less depth to it, since there's only one. Tanks basically have two choices - stand in the front and try to be a meat shield while your team gets a pick, or dive the backline and hopefully secure a pick before the rest of your team falls over. Either way, there's a lot of pressure on the tank to do the right thing, and a lot of pressure on the team to keep the tank alive.

Healers became too easy to pick off/couldnt do much to protect themselfs

I strongly disagree with this (except if we're talking about Lifeweaver). All of the supports have enough tools to at least escape a 1v1 situation against most DPS characters, if not win it. They all either have movement, CC/knockback abilities, raw damage output, or usually some combination (or all) of those. Being able to regen health out of combat also makes supports less reliant on health packs or self heals, which helps survivability as well.

The change from 6v6 to 5v5 was one of the worst changes for me, it made it rely on individual performance way too much... one pick and your teams fucked

I've noticed the opposite, that is actually easier to turn a 4v5 or even a 3v5 with a single well used ult, where in the original you'd have to use at least two ults to burn through two tanks' HP.

IDK, at the end of the day I enjoy both games gameplay wise, but they are very different experiences, so I understand why people have preferences towards one or the other.