It alternates well between action and wonderment, which are in ample supply, though I must say that some characters do not develop at all, and some are unconvincing in their supposed roles. At certain points, the animation and dialog are a little over-the-top in ways I can't describe. There are some small story gaps, but given the length of the film, they are safely ignored.
This movie is a unique blend of sci-fi, fantasy, action, and adventure with a touch of emotion that is a feast for the eyes. The story is of the most epic proportions and does not fail to entertain. I found the whole 'experience' enthralling.
I don't know if I can watch this movie in 2D and find myself wanting 3D Blu-Ray now... as impractical as that may be.