To settle any future arguments: FF XIII has not been announced for the 360. MGS4 has not been announced for the 360. Stop basing your arguments on being "pretty sure it's going to the 360."
Bet with disolitude: Left4Dead will have a higher Metacritic rating than Project Origin, 3 months after the second game's release. (hasn't been 3 months but it looks like I won :-p )