Good movie overall. Thematically a little advanced for young children, but my 5 and 6 year old did fine even with the sad beginning. The action scenes at the end were good and not too difficult for them - they were roughly the same as the action at the end of Monster's Inc. Very good story - well thought out and the characters related well to each other.
my wife and two daughters and I all really enjoyed the movie. very pleasant surprise that there was enjoyment for everyone. All thought is was much better than Madagascar 2 or WallE.