I played this yesterday for the first time and I can't put my finger on it what feels different.
I main Ana and not having my trace behind the bullet easily seeable is tilting.
Everything feels like a bullet sponge? Is that it?
With only 5 people it seems to put a lot more emphasis on punishment for dying?
Healing wise it feels like I'm doing nil compared to ow1?

I cant figure it out.

5v5 ruined the flow of the game imo it's not bad but 6v6 was better they should've just nerfed shields

Same aimbots.

ex top 500 in ow1, and gm in ow 2. Just my input 5v5 makes the game more punishing like you said. Single heroes can now hard carry a lot easier than ow1, a good dps can absolutely terrorize low elo's and solo win games. Ana is one of those high skill cap heroes, with absolute dogshit mobility. Easy to get snowballed now if other team running kiriko, lucio.