Su-u-u-u-usan.
I went mainly because I saw Stephen Colbert was the voice of the President(hopefully an omen for 2012) but was expecting little more then a kiddy film. Boy were my expectations low, it had a good mix of humor that adults and children alike could enjoy. There were scenes that kids were laughing out loud at because of the humor, while subtle(somewhat) references to older events that adults are infinitely more likely to get/understand.
It also had a good steady pace for the storytelling with a clear beginning, middle, and end that doesn't seem to happen as often as should in movies nowadays.
The voice acting was very solid, the CG was excellent and the story was good.
All in all, I'd have to say to go see this movie in 3D soon. If you have kids, they'll love it. If you don't, that's fine. Don't be afraid to go alone, thankfully the stigma of not being able to go to a "cartoon" without a kid as an excuse is slowly but surely dissolving.
Thanks, and happy watchings.