The things Disney is doing with this new 3D technology are really amazing.
The movie starts out with a few gratuitous 3D effects (and there's a few more towards the end of the movie, too). However, there are a number of scenes that are specifically created to really deliver amazing 3D effects. Towards, the beginning, there's a scene with a bridal march that astounded me, and there are a few long-shot scenes that are pretty impressive.
Overall, it wasn't very humorous. The adult jokes that were in place were extremely forced, and the few funny instances probably weren't intended to be as funny as they were, to me. Steven Colbert was not in the least bit entertaining as the President; I honestly expected more.
It felt like a really elaborate tech demo to me, but that's okay! I like techo demos! There were a few moments where I took my 3D glasses off to see how the film looked without them; it was good as an experiment. Some scenes were okay, but some were unwatchable.
The good news for glasses-wearers is that we were accomodated with the 3D spectacles, as I was able to wear both my glasses and the 3D plastic glasses at the same time (though mildly uncomvfortably).
Some of the previews were in 3D too, and they were of movies which were announced over a year ago. It's clear to me that Disney is embracing this new approach to 3D, and is delaying movies so that they can be 3D-ified.