Faves: RPG, Shooters, Sports, adventure
Least faves: RTS, racing, simulation (i.e. flight sims, simcity, and the like)
But this doesn't mean I can't enjoy any genre. I really liked Need for Speed: Carbon, as well as the original Starcraft, and I even had a bit of fun with simANT when I was younger. Basically I don't really like games that don't have a story. Even just a threadbare one. If a game has no story, chances are I won't play it for more than a few minutes. I'm not the type of gamer who plays to be good at a game, or plays for the challenge of it. I just play because I like being an active character in a story, which is why I like RPG's the most.