Wall e is one of the best animated films made, pixar really are great.
However, I'd say this one has some deeper messages though than say "finding nemo".
Wall e has been cleaning up earth for 700 years alone, whilst humans have boarded a huge spaceship and have become overweight, and lazy. This all changes when EVE comes to earth in search of plant life. Wall e falls in love with EVE, and a journey through space begins.
Children and adults alike will love this film, maybe for different reasons, everyone will be charmed by it, but children may not understand the deeper messages about humanity it brings.
If youre a fan of great films (there will be blood, the dark knight, oldboy etc) dont miss out on this one.