How do you know a champion is underpowered?
Lets look at this logically?
Does anyone ever complain about Jax being under powered, weak? Or Fiora? How about Garen? Darius? Diana?
No. Because they are not.
The fact that some champions are complained about by many people as being under powered or too weak can not be mass delusion. It wouldn't be a thing that is brought up if it wasn't some truth to that.
That is why you will never seem posts from people complaining about Jax needing a buff...because there is nothing true about that, you will never see anyone do it, and if you do, it will be 1 crazy isolated incident.
So as an Aatrox main, when I see many MANY other posts from people insisting he does need a change and currently is rather weak, it is totally wrong for Meddler to come along and say they think he is in a good spot. Based on what?
And not just Aatrox. The same is true for many other champions. It really does seem like Riot has their pet favorite champions and the hell with the ones they don't like.