I remember renting this game about 4 or 5 months ago, I played only 30% of the levels, and returned it. I thought it was too childish and that I will never see it again, until my kid suggested that I buy it again. I don't know why it appealed to me that day, but it just did. I graped it and brought it home.
That was two weeks ago, I still play this game. Designing useless objects, playing story levels over and over, hooking up with random people, and playing user made levels has given me a joy i haven't seen in my whole life. I love this game, and I think will stick with it for a while.
What did you think about LittleBigPlanet ?