I've always loved RTS like age of empires and starcraft, that's what got me into playing computer games, and I enjoy messing around on an RPG now and then, but I've never personally seen the appeal for sports games since it's much more fun to play them in real life.
When I get time, I love Madden and NHL (any year, but the more current - the better). I was hooked on Fight Night for a while too. I will play any sport game, but I usually have to wait til our son is in bed and my wife is done watching TV so I don't play very often anymore.