Games that purpose a point. I by no means have to continue playing games like GTA over and over again, because it's sandbox and the point is usually part of the story. Whereas in games like RPGs or maybe the recent New Super Mario Bros where the point seems to be get a "perfect" (in the latter case THREE FRICKING STARS! BOOYAH! Thank you very much) I tend to play them again and again until I've reached perfection. If there's no perfect endgame purposed, then I don't have to devote a troutload of time to it.