Aatrox has some issues

I felt that aatrox was in a pretty good place a while ago, his damage and sustain were fun to use and his abilities felt really unique without feeling cheesy. After sated devourer i think things have changed. a couple games ago i played against an aatrox, he didn't play very well, missed most of his dives and slows, missed alot of last hits and ganked poorly, but he had devourer. around 35 minutes in he had finally stacked it and oh god. he had only devourer and i think a BotRK and he was un-killable. I was playing the GP build full ad and with me, our nautilus ccing him, our ez and our renek all hitting him inside my ult. he didn't take damage. i was shocked to see that in fact, he was HEALING. he overall health-count was in fact increasing despite the concentrated attacks of 3 other champions inside a GP ult. he wasn't fed and had less items then all of us but was able to fight us all off and leave with full HP and we couldn't stop it. He later did the same thing again. he was the only champion alive at the time, and tanked 5 poeple while taking minimal damage until we all bursted him during a knockup. This item has turned several decent champs into unstoppable god monsters and honestly, I dont like it. I don't mind a champ being a little too strong or even a little too weak. i just want it to be fun to play with and against. I don't mind champs that are weak, i played urgot for a while, i love eve jg and the old GP was really fun. I think at the end of the day people forget that this is a game, meant to be fun to play. even if the item is perfectly balanced, its just not fun to play against and i think that that is an important consideration to be taken into account aswell.