(Wife): When I worked in an elementary school, our first-grade students watched this movie as part of our teachings on environmental stewardship. It also imo kinda satirizes consumerism, which I think is needed in our modern society.
At home, my mom and dad; husband and I; and sister / brother-in-law -- three households, each home to at least one electrical engineer -- each has a copy of this. It's one of our favorites.
It's a great message and storyline; we enjoy Pixar's sense of humor; and the sound effects, voice casting and musical score are fantastic. Seriously, I love the musical score! It's beautiful, and I often hear parts of the score playing in my head after watching the movie. This movie also contains the best usage of Apple's Machintosh boot-up "dong" sound I've ever heard -- kinda a joke in the movie, if you watch it. Overall, a job well-done, imo.
In my opinion, Sigourney Weaver's "Caution: Rogue Robots" line as the voice of the Axiom spaceship may end up her best line ever, although my personal favorite exchange is between Auto the autopilot and the Captain:
Auto: "On the Axiom, we will survive."
The Captain: "I don't wanna survive. I WANNA LIVE!"
Words to live by, imo. = )
A note to parents: Does this movie deserve a G rating? Well, there is some violence and pistol usage (and couple explosions from the gun blasts) in the movie. No human characters end up seriously harmed, although one robot character -- a villain -- does "die" resisting the protagonists in the story. (There is a moment of peril in the movie, but the protagonists live.) Other than that, Wall-E does end up putting a bra in his "interesting finds" lunchbox, and Eve does scan a port-o-john. That's about it. But, if you would wish to avoid the movie, due to gun violence, I can certainly respect that.
For what it's worth, our three-year-old likes this movie and watches it fairly often. But, we also watch it with her, and she is not super-sensitive or afraid of much of anything.
Another factor to consider: This movie goes long stretches with no dialog. Personally, I've used that time to describe to my daughter what's been going on, and to voice what some of the robots are thinking. (You can tell by their actions and demeanor.) So, I've used this movie as a tool to help my daughter develop listening skills -- which have over time grown into speaking skills. This is unusual to find in any movie, so I appreciate it.
As an added bonus, the movie also helps introduce our young daughter to the concepts of a round earth, rocketry, robotics and outer space / space exploration.
So, I would say that overall, Wall-E is entertaining and can also function as a great teaching tool if you're just creative with it.