A passable animated adventure for the little ones that will barely keep the interest of their accompanying adults. It's not inherently a bad movie and there's nothing really wrong with it. I guess it's just not a memorable feature.
The technical aspect, as it's expected nowadays from any animated production, is very good. I didn't see the 3D version, which might have wow'ed me more, but if that's the case then it's a feeble justification for making the movie in the first place. The movie needs to be good whether in 3D or not, especially if you offer it in both formats. Otherwise it's like one of those movies that suck but look great (Godzilla comes to mind ... what a bore ...)
3D viewing is supposed to have greatly improved and a slew of offerings are going to pop up on the screens in the upcoming months and years, but being in 3D cannot be the only magnet for a movie, or it will inevitably fail to deliver a good experience.
Not much else to say about it. See it if you're really into animated movies, but I'd wait for a cheaper medium, rather than pay for it in a theater.