It's cute but it's trying to teach us something like Ferngully (sp?) did. And as facinating that is to a little kid as an older individual it's a bit like getting beat over the head about an issue.
I liked Ferngully when I was little. Saw it a few months back again and realized it wasn't nearly as great as I'd remembered it. Which is sort of sad actually.
I feel happy feet will have a same reaction in a few years.
Cars... not Pixar's best but for cheap entertianment not so bad. If anything the short was better than the movie. But that's because I love music and I'm biased in that sense... and slapstick is always fun.