Actually, I think that, like The Incredibles before it (although I know that Incredibles wasn't Pixar's last film), ... where was I?
Oh, right. Like The Incredibles before it, this movie is a perfect family film. It entertains the very young without boring their parents. Most things I've noticed are aimed at one or the other. Try watching Thomas the Tank Engine some time. My nephew loved it a year ago when he was two. Perhaps that's unfair. I remember trying to watch Voltron. I was 20 and I recalled loving it when I was 6. It was unwatchable.
Basically, most things intended for the young are insipid, bland, and vile to the old. The younger the intended audience, the more insipid, bland, and vile the result. In order to make something that's enjoyable for any audience, you have to make a product that is bland and insipid. But when you have a little more experience, the result is deeper and more amusing. And when you have more experience still, you get even more out of it. Andc. andc.
In short, it's a marvelous masterpiece of entertainment. Incredibles has the occasional joke about sex and aging that your average 5-13 year old will completely miss. The environmental stuff and the corporate stuff in Wall-E is only there for the adults/teens. It's good for them, it adds to the depth of the movie, but the little kids, who will also adore the movie for reasons they don't understand, will completely miss it.
