Aatrox is a champion that needs a rework/chance/buff as soon as possible
Lets take darius (even thou he is very over powered at the moment ) for example he has better base stats, scales harder, deals more dmg, heals more, has a bigger impact in team fights, has a better 1v1. Doesn't have cap closer easily kaited. Can build full tank with one dmg item that makes him tankier, scales with cdr. (Both Aatrox and Darius can split push and fight 1v1, but darius also can team fight Aatrox can as well but darius is better at it and he is better in a 1v1 situation because he can go full tank and deal more dmg than a Aatrox can)
Aatrox has better early, weaker mid and late game. Doesn't have passive armor shred, doesn't scale with cdr, is heavily reliant on aa do to dmg and heal. Gets shut down with cc, aa slows, armor, ignite, grievous wounds, has a interruptible short cap closer with long wind up and high hp cost, long cd, and a knock up.
Revive that is less than useful. Because lets say you get ganked and the enemy gets you to 0 hp and your passive pop and you revive and they don't tower dive you good right you survived no it's not good
- you could have survived if you would have had better base stats that scaled better
- you come back to lane have way less pressure because you have no revive, you have to play more carefuly
- Ganking you will be more easy coz no revive
- Lets say you are in a 1v1 fight and don't have ignite but a tp your passive gets poped you go to your stasis mode and enemy got rely low as well a) enemy runs away he comes ahead i the fight because you lost your passive and he lost nothing b) he kills you if he has a stun or some smg ability because you lost all your aa speed boost from your blood well and you don't gain that much hp back c) enemy does a massive mistake and stayed to fight you with 100 hp you win the fight probably if they don't have a stun and burst, when you revive your w resets so you have to stack it again so you can't heal right after or do the bonus dmg.
- in a team fight your passive gets poped your team loses the fight you die, lets say you had some other passive and better base stats you could fight longer but your team lost the fight anyway you still die. Same result except in one of the fight you got to fought longer (the one with no revive passive and better stats) you would have had better chances of winning. Because once you come out of your revive state you pose little threat compared to when your had your revive available.
Revive should be used on champions who do most of their damage with abilities and are burst champions not fighter who take time to do their damage.
In Aatoxes case especially because he loses all the aa speed boost from the revive and suffers because of the revive he bad base stats and awful scaling on his stats and abilities.
This was just his passive the entire kit needs chances not a complete new set of abilities but chances to the current ones. Some ideas on that can be found here.