It is funny with Mario Galaxy I remember before it came out people were saying "Is it too different", now some are saying it is too much of the same? Mario Galaxy was a large evolution in platforming putting together a game with a concept that had only been touched upon in previous games. It was a fresh experience and I'd take Mario Galaxies well designed, and innovative worlds over LBP's user created content.
Now don't get me wrong, a game like LBG is great, but still nothing beats, at least in mind mine, then a finely crafted video game from some of the best and most creative people in the industry.