1. WALL-E
2. Toy Story 3
3. Finding Nemo
4. Toy Story
5. Ratatouille

Actually, I've loved every Pixar film I've seen, and I've seen them all exept Cars and Cars 2. They're the only two I've yet to see, because I despise both Nascar and Larry the Cable Guy. I'm not saying they're bad movies, because without seeing them I can't know. However, I don't ever want a reason to dislike Pixar, so I'll continue to stay far, far away from those films.