G.O.W.

Gears of War came out for the XBOX 360 last week, and I've been spending the day playing the hell out of it with a friend. You know it is a good game when you beat it, and then immediately up the difficulty and begin to play through it again.
So: from now on that will be my standard for when a game is "good." If you beat the game and then immediately decide to replay it on a harder setting, you must have enjoyed the experience enough to want to do it again.
Must...go...play...