*spoiler warning - don't read below if you don't want to know about the movie.
I honestly was disappointed in the dismal tone and lack of comedy in a pixar film. It was cute and clever - but didn't live up to all the hype.
The entire first half shows a dead, deserted earth, in which wall-e's have been attempting to clean up for the past 700 years. The Wall-e is the only robot left of his kind, scavenging parts from others, and continuing to try and clean up the earth. Depressing.
When we finally do see humans they have become lazy slobs that depend on robots to serve them. After 700 years they've even lost their own humanity, and bones. ugg.. more depression.
I did like the humanity that they put into wall-e, the awkward love story, and the contrast between the lack of humanity in the humans (at first). At the same time they left a lot of unanswered questions, like why does Wall-e even have humanity programmed into him? Why was he the only one that was able to survive 700 years? Did he have a female Wall-e counterpart? Can Twinkies really survive that long?
The film is indirectly saying the entire time that 'if we don't clean up now, this is what is going to become of us and earth'. Why did Disney/Pixar feel the need to inject this mixed post-apocalyptic message into a kids movie? This is far worse than Simba's dad dieing. At least the Lion King had a better story, and it didn't result in kids bugging their parents to buy trash compactors. I much rather have a cute Lion, sorry.
I could go on into inconsistencies in the movie, like if humans could build a spaceship to house all of humanity and build intelligent robots, why couldn't they get rid of some trash? Or how did all those satellites not crash into each other and form rings like Saturn?... but that would take too long.
I will hand it to Pixar for making a film that makes you forget you're watching animation. That was amazing. They've come a long way since Toy Story but unfortunately took a step backwards in plot.