Nirvana and Soundgarden with your friends, they probably wouldn't look all that kindly upon your affection for Boyz II Men. But even then, you can't always help what you like.
The same goes for MMOs, which are halfway to being social cliques in and of themselves. Maybe you would really like to feel indignant at Star Trek Online's handling of the franchise but enjoy the gameplay. Perhaps you want to be too cool and jaded to like World of Warcraft but you have too much fun with the game to manage that. Hey, you might even really like EVE Online for its PvE content but be embarassed to say it.
We all have games we play or have played for reasons other than the game itself, and this is the inverse -- you like the game, you just don't usually want to mention it. What game do you really like that you kind of wish you didn't?