Major thread drift here, but just to be fair, the box office receipts really don't agree. Here's how Box Office Mojo currently ranks the Pixar films:
1 Finding Nemo $339,714,978
2 Up $265,851,836
3 The Incredibles $261,441,092
4 Monsters, Inc. $255,873,250
5 Toy Story 2 $245,852,179
6 Cars $244,082,982
7 WALL-E $223,808,164
8 Ratatouille $206,445,654
9 Toy Story $191,796,233
10 A Bug's Life $162,798,565
While it might possibly be argued that, adjusted for inflation, Toy Story and A Bug's Life were bigger hits, Cars still made more than WALL-E and Ratatouille, which were both highly regarded by critics.