Remember those recent Aatrox buffs/changes?
Yeh well they made him even worse. 
Current problems:
-
His passive/extra life requires his bloodwell to be filled. Your bloodwell fills 20% from his E (12-13cd) and his bloodwell fills (mainly) from his active w. His bloodwell takes so long to fill from autoing that his lifeline passive is almost never up.
-
Due to his passive almost never being up throughout the game, nobody is even slightly afraid of him in lane.
-
By chance you get your lifeline passive, it lasts about 4-5 seconds before it goes away. That is if you didn't use it. If you didn't get to use it, you probably have almost no hp and will die regardless.
-
Aatrox is so squishy throughout the entire game regardless of items.
This legendary warrior gets dumpstered by every champion in the game 10/10 times. Yet they made Zac even better.