Re-watch value
When I first saw this I thought it was an ok Pixar film but not one of their best. There was something in the style, story and characters that was a bit different from what they usually do, and for that reason I didn't think it was as good as films like Toy Story, Finding Nemo or Wall-E.
However I occasionally watch it again and it does get better with every viewing, or at least I appreciate it more than I originally did. It's funny how some films can do that, I'm wondering what it is that makes some films improve with repeat viewings.