Fourth for me... I'd put Incredibles, Up, and Finding Nemo above it, but that's just me. Wall-E has some emotional moments at the end, but nothing can compete with the pure gut-punch that Up gives you to open the film.
A wonderful build though, the best one up there. I'd actually run across it a few weeks ago when I was watching Wall-E with my daughter, and was thinking "now this would be an Ideas submission that would actually make sense."
If the above post didn't offend you, you're probably reading it wrong.