I'm sorry, what are we admitting again? First of all I was referring to the 6.9 version of Guinsoo's anyway, which no one used and was considered a troll item that only trolls purchased, so no, the problems you experience with it nowadays were not even remotely an issue back then. Context is important. As for the new Aatrox...
Just what about him is balanced, exactly? He is literally designed to either 100-0 somebody in one combo (oh yes, because that's fun to play against right?) or be completely useless if he can't seal the deal with that one combo. He was designed with today's meta in mind. Do you understand that? He either instakills or he accomplishes nothing ever. He isn't like Darius who can keep beating the hell out of you with autos and make you bleed to death as he face-tanks everything you've got with his manly base stats. Aatrox's combo is all he has and it's on a long cooldown. What does that mean other than "instakill meta"? As soon as the meta changes to not be a oneshotfest, he'll never see the light of day because it's all he was designed to do. Assuming people can stand his clunkiness long enough for that to even happen.
He's not going to be fun to play alongside because you won't be able to rely on him doing ANYTHING half the time since his Q, which is all he contributes, is designed to miss a whole lot. You'll always have to plan around the idea that he probably won't be helpful.
He's not going to be fun to play against because if he does hit you with his combo, you're just instantly condemned with no say in the matter.
Look, I can agree with you that certain items in the game are infuriating pieces of garbage
but saying that anything that doesn't use those garbage items is good or balanced is just feeding into other equally crappy problems. Lets just agree that those items are toxic trash, AND that this rework is specifically designed to be unfun.