The thing about LittleBigPlanet, that makes it different from SO many other games out there, is that it REALLY IS as good as everyone hoped. It starts out good, and then you dive into another aspect of the game, and IT'S STILL GOOD. And then another, and STILL it's everything you imagined. LBP is a game that continuously gets better as your explore it more. Add a second or third player, and suddenly the game is immense fun. Playing around with the levels is great, and even better (again) with more people.
This is a game that, when I first started playing it, I was thinking "oh no... this game just isn't what everyone had hoped," kinda like Spore. But then you quickly begin to realize how amazing the game really is. There is, essentially, no reason for this game NOT to do spectacularly other than pure lack of knowledge of its existence.
Wow, that sounded a lot more fanboyish than I thought. Oh well, the game really does live up to expectations, so there's nothing for PS3 fans to hide.