Aatrox's rework honestly isn't bad but I understand why people don't like it
First off, his kit is pretty meh. Passive is pretty uninteresting They took away his Q and turned him into another Yasuo/Riven. His W is a neat idea the way it looks but in reality it's just Viktor's field thing. His E I mean, again it's just another yasuo/riven ability or I guess lucian fits it better since it can go over walls easily. His ult isn't terrible but it's not really all that new. (Being able to move around while reviving is stupid af tho)
As far as his design goes. I honestly don't think the personality he has should've been put on him. It should've gone on a new champion as it's not bad it just doesn't fit.
Vaarus isn't much of a hyper chit chatter, nor is Rhaast. He has his moments but generally he's pretty chill when he talks. It should've stayed that way for all Darkin rather than turning Aatrox into some russian roaster or w/e accent that is.
I think that's where most of the hate is steming from. Nobody bashed Aatrox for his personality he was just an awful champion that was executed horribly in which he was either massively busted or he was just useless. His character should've stayed calm, collected and experienced. Now he just sounds like a typical league 13 year old. Which if that's what you were going for, stop it. You don't need to appeal to the young ages to bring in more players. You need to fix your game