My son is a connoisseur of Pixar movies, and he has watched most of them enough times to be able to quote them from memory.
After an extensive three-round ranking process, the following are the Pixar Movies ranked from best to worst, according to my 11 year old son:
Toy Story 3
Toy Story 4
Toy Story 2
A Bug’s Life
The Good Dinosaur
I think his ranking is decent, except for the position of Cars 2–that was a terrible movie.