Wow! Fantastic imagery - there were times that the scenery was just so great just to watch float by, that I forgot most everything going on. The scenes meshed quite well between live action and computer animation.
Plot? Not nearly as strong as it could have been, that much is certain. The smaller kids would be bored to death.
The bleak reality that humans are willing to steal and kill for profit, and not have any conscience about it either is not much of a plot.
The end of the movie tumbles over the cliff of pseudo-reality altogether, making it appear as if the greedy humans won't come back after one simple battle?