People, calm down it's all of our faults. People would just boo a level because it's "not" fun. Or your jealous so you boo. MM has a reason to resolve and help, not let people not share your opion. MM wants you have a dream, not a crushed one.
LBP 2 is not ruined. if you dont like a level just simply dont rate it, or dont bother finishing it. And why are ppl saying tht the boo button was a tool for advice?(yes sometimes it can) but it doesnt mean you cant give tips to the author of the level, you still can without booing. This will make the author happy, and he wont feel bad about it!