I think I may have been the first one here to post about Wall-E. I loved it, of course.
One of the great things that tie the Pixar films together (aside from Ratzenberger, who voices John this time around) is the sense of community that they all have. From the toys in Andy's bedroom, through the ant colony, the monster city, the various communities below the sea, the town of garages, and Paris, the adventures of the lead characters have always been seen against the credible worlds they live in.
OK, maybe Cars isn't a good example of credible. I mean, how did they build all these things? Cars don't have hands, dang it! Which is why, of all the Pixar films, Cars is the only one I don't care for. (And this one is up for a sequel? Sheesh.)
And The Incredibles is about a family forced to live without it's community, a community of superheroes who have subsequently been killed off.
Wall-E is different. Wall-E doesn't have a community. He's the last of his kind, and everyone else has either flown off or broken and can only be used for spare parts. But part of the story is how he then finds a community by following Eve. It's a community of both humans and robots, and maybe because of Wall-E the two parts of that community will become one.
Yep, I love Wall-E. And Wall-E.