Typical fantasy/action flick, nothing interesting or compelling about the storyline or the characters. Interestingly, although it might be characterized as a "cartoony" flick, the characters were less so than in Cameron's "Titanic." Sigourney Weaver turned in a good performance. Otherwise, ignore the pseudo-spiritual mumbo-jumbo and concentrate on the fun, and it's certainly ok.
On the technical side, the CGI was great, although the 3D seemed a bit uneven at times. For example, some of the shots of ships flying past seemed to have no 3D at all, while the shots in the forest of the ash floating around seemed almost as if it was falling in my lap.
So it looks like we're not quite there yet with 3D. Another 10 years, who knows?