I don't really feel like getting caught in this thread...
My opinion is that LBP looks like a much bigger game with more effort (and money) put into it, and it's one of the reasons I'd even think about getting a PS3. This Blocks game looks fun too...it's just a different game though.
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 )