the way LBP is now, the experience is pigeonholed into side-scrolling gameplay. this will have some serious impact on long term motivation. there are only so many things you can do with side-scrolling gameplay and the industry started with side-scrolling games 30 years ago!
i think LBP will have a very strong but short pike of success. you just don't have enough options to support new ideas and gameplay over the course of months or even years!
I don´t get this, your blaming the game for only being "2D" while you yourself point to the fact that this a 30 year old genre. There is a reason we have played Side scrolling games for this long
You are given a blank piece of paper and a pen, there is no limits to what humans can create with that. This game is in it for the very very long run.