At the moment I'm not replaying anything actively. I used to a lot, then less and less. My most replayed game is probably either Castle Crashers trying to unlock every character, that cause problems when I'm starting a new game with some friends (they have Lv.1 I got many, many more), or pokemon silver, which I never finished. I guess ever since I started TF2 I can keep playing that 'never ending' game and not replay games I know the story, when I do for other games, it's usually to analyze the details or hints toward the main plot, or make fun of it by changing lines in my head.