Be careful if your kids get frightened easily at movies. We had 2 5-year-olds - 1 of them had to leave because he was too frightened. We also had an 8-year-old who had to leave during certain parts of the movie. Our 9-year-old did OK throughout the movie.
We enjoyed the film and appreciated the subthemes related to global warming and taking care of Earth and our wastefulness today. Younger children will not get these subthemes. But, our children seemed to enjoy the robot characters, the friendship between Eve and WallE, and the action scenes. The packed theatre clapped at the end of the film.