Movie presentation was excellent. Nothing great about story and I am sure kid's will write better than this. Old story molded with new technology helps the movie to get watchers. We can certainly watch one time. Surely not a kid's movie (PG-13 stands right!).
If we would have got the exact same movie from a new coming director (other than James Cameron), then it would have been a flop. Directors name helped to pull this off.
If you are going with 5 year or younger kid's, I am pretty sure they will fall asleep.
Animation and the way how they leveraged the technology is excellent. We can certinaly watch one time for that.