Little Big Plaenet. Enjoy that far more than any competitive shooter. Fun, creative, and can just relax and be silly with a friend. I'd take that kind of game over Halo any day. Probably why I love minecraft so much too.
Metal Gear Online. Call me a troll, still the most fun i'v ever had with a game online.
I LOVED mgo, I really hope they bring it back in the next mgs game.
CoD is the FPS king. You kids can live in denial all you want. Tell me what game is topping XBL activity list. Then come back six months from now and answer the same question. The same game will be #1 and it sure as hell isn't Halo..