Glad to see I'm not the only one who hates Plaza... I can just never seem to get a feel for the flow of that map.
Besides Plaza my most hated map is Carrier -- as mentioned, too gray and snipey. Other than that I can't say that I hate any of the maps, though I dislike playing Aftermath, Downhill, and Express.
Hijacked and Aftermath. Hijacked because of the spawn kills and I just don't like Aftermath. It reminds me too much of Downturn in MW3
Aftermath, overflow, turbine and carrier I refuse to play. There are others I am not find of but ill still play them.
Turbine is one of the worst maps ever I think. I have played every game mode on it, and they all suck there. Certain maps play better than others depending on the game mode, but no game mode plays well on Turbine.