IMO new Aatrox's problem is his E.
This ability is so lackluster. It feels like the only reason its even there is to be used with his Q and it's pretty bad at that too.
The ability is bad at everything it does. Bad at mobility, bad as an AD steroid, bad to combo with his Q.
I don't think there's an ability more useless than his E.
For what Aatrox is meant to be gameplay wise and thematically it has no place in his kit.
Built in damage so you can build tank.
Built in tank stats so you can build damage/hp instead of pure tank.
Built in survivability and true damage.