I loved Wall-E, and recommend people go see it. But for those who think it is Pixar's best film to date, please rewatch The Incredibles and definitely Finding Nemo. Those films are near perfect.
Wall-E flaw is that the story gets a little muddy, and a fair number of kids get confused as to what is going on once we get to the space station.
I rank it number 3 from Pixar. Excellent, excellent film though. I'm proud of them for pushing a story like that out to the masses.