If I wanted to get a lot of 360 fanboys to review a PS3 game, I would read Kotaku not this thread.
I would really like to play L4D. I may pick it up for the pc if a PS3 port doesn't come out next year. I have played through R2's campaign twice and logged 75+ hours of coop and mp. I can say that it is the best FPS released on the PS3 this year. I do not have access to a 360, so I can't compare R2 to any 360 only games.
Thanks for the input, Jeff.