RPGs, since many FPS games are not friendly for one handed play, not to mention I like playing alone.
I agree with this one. RPGs do not have that great of a replay value, but DQ 3 and 5 seem to be an exception, since you can customize your party or even solo the game and things are a little different in DQ 5, depending on who you choose to be your wife, especially in party chat I hear.