Aatrox needs a lot more changes to fix his horribly designed kit.
His Q is probably the easiest ability to dodge in the entire game, aside from his E, both of which have shit base/scaling damage.
Yet, if he misses either of them, he is punished INSANELY hard, as he will be kited without any issues whatsoever.
But it usually doesn't matter, since his damage falls off harder than almost any Top Laner. If Renekton and Panteon are naturally outdamaging a duelist-type champion late game, there's a fucking problem.
In the Jungle, his clear is pathetic, his ganking is only decent, and he can be bursted by any other Jungler since he has THE LOWEST base health of any melee champion, which is sad considering his secondary role is "Tank." Also, why not just pick Xin, Udyr, or Jax?
He needs to build tanky in order to get the most out of his "focus me!" playstyle, yet his %Health costs punish him for doing so.
His Passive makes him impossible to balance, since the value of a free revive is impossible to calculate, yet it's probably the shittiest revive in the game, since he loses all of his Passive attack-speed, making it impossible for him to fight people when he actually revives.
Also, his Bloodwell starts draining WAY too quickly; the time it takes to start draining is half the time it takes for Renekton, a champion Riot has stated should ALWAYS be in combat during the lane, to begin losing his fury, and Renekton's abilities do not cost health.
His ult sucks. Just flat out sucks. He already gets a dick ton of attack speed, so giving him more doesn't seem all that fun. The base damage is high, but as an AD champion, why does it scale with AP?
The only good thing about the ult is the extra range he gets, which usually doesn't stop him from getting kited.
His E and Ult interrupt his auto-attack animation, which makes them undesirable to use. No other auto-attack reliant champions have their auto-attacks interrupted by using their core abilities, so why should he?
Finally, his 3-hit effect system is really terrible on him, as the only way to proc it is with auto-attacks.
Almost every other champion in the game has a different way to proc these, whether it be an ability like Braum's Q or Ekko's Q or Gnar's Q applying it, or giving the champ an auto-attack reset like Vayne or Jax. Also, no one ever uses the damage part of his W after the laning phase.
Aatrox is completely and utterly broken, and needs a totally new kit; it fights itself so much, is mediocre in comparison to similar champion's kits, and is just overall clunky and ineffective at doing its job.