I think it's funny to listen to a guy who hasn't really done anything new since Quake 2.
You clearly haven't got a clue about anything when it comes to computer graphics do you? Maybe Ids games haven't been 'great' since Q2 (which is widely considered the best FPS of it's era, and I personally hold as the best multiplayer shooter ever lol.) But there are significant technological break-throughts that would likely not ever have happened if not for John Carmack. What he says holds great weight in the industry simply because without him, we'd all probably still be playing 2d games.