I don't know if it's specifically the videos I'm watching or what, but it sure seems like the framerate drops quite a bit on both platforms, though especially 360 during load times.
LEFT4DEAD411.COM
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 )