A girlfriend-approved game.
LBP is in my opinion a pretty easy game. It's definitely for a casual audience. I like that aspect of it because it is easy to sit down and play a couple of levels inbetween my busy life instead of playing a hardcore story-driven game.
What surprises me most about the game is its engine. I have never seen such a robust engine before that can do so much. I am surprised that you could control vehicles, have awesome side scrolling shooter action, and epic platforming sections up giant robots.
In addition if you are OCD about collecting everything, you will probably commit suicide because there is so much stuff to collect.
Little Big Planet 2 is not without it's faults though minor. I have found that most player-generated maps are not worth it because they aren't as polished and detailed as the main story levels. I guess they just aren't my thing.
I am a big fan of miniature levels. Thematically I liked the variety of levels from the first game more than the second.
Overall this is a great game and I recommend it for all.