3 I like the most in no particular order.
WMD...Decent size map, pretty cool areas to pick off people with your Assault Rifle who are dumb enough to try to snipe in this game.
Cracked...If you capture B Flag in Dom, you can rack up kills on this map.
Grid...I always seem to do good on this map. Once got 3 Chopper Gunners in one match on this map.
3 I don't like in no particular order
Firing Range. I'm just not a fan of it really.
Summit...Okay Summit IS my most hated. Everyone is just fighting to stay in the computer room and people always vote it, like WTF
Hanoi....I understand it's a night map so they thought that'd be cool, but it's really not. And it's sometimes terrible for my Chopper Gunner