.hack is a game (games?) i'm close to finishing, but it's repetitive game mode can put you off for a while, which is a problem. I hope that's changed for the G.U. series. It really is a good game, but it shouldn't be on 4 different discs when a whole final fantasy fits into 1 and needs to have a bit more variation to it.
DDR (or Dancing Stage) is brilliant. It gives people the illusion that you can actually dance and exercise as you do it with a calorie burner in the PS1 versions. I always seem to play when i'm in the arcade, but i must start playing that again.