A 38% winrate doesn't lie...
I've played Aatrox a lot, and i can honestly tell that i hit like a wet noodle since 7.5.
The one thing that he does better than before is being tanky. The removal of his health costs and the %health scaling on his heal helped him becoming tankier. Before the changes, building tanky meant that you would deal more damage to yourself than the enemy from using your abilities.
So yeah... he feels tankier... but he deals very little damage while also being very easy to kite.
Also, as a diver, his passive was really useful to help him survive the first round of spells. With 7.5, if you dive and fail to get all your passive stacks, he will just die.
I played him a few times since last patch, and yeah my scores weren't bad either, but i feel so much useless when playing him, i have no impact on the game, i can't 1v1 anyone, i get kited, i die with 4/5 stacks of passive. He's really frustrating to play.
He was already weak, but the nerfs hit him so hard he's unplayable, and until he gets fixed, it's probably better for their team if Aatrox players pick another champion instead.