When I was attending an open house at a college I was looking into (And later attended for a few months), the speaker, Frank Espinoza, talked about what cartoons should do. Specifically, they should do things that can't be reproduced in real-life. An example he used was Iron Giant - he didn't like how the kid (can't remember his name at the momest) acted like a read kid. "When he's walking up to a wall, instead of turning around, he should have started walking UP it." It almost struck me that he considered the defining aspect of animation to be slapstick. I've always thought that some of the best animation was the type that could have been filmed but conveyed the same emotion through animation.
How does everyone weigh in on the matter?
For anyone one that may not know, Frank Espinoza designed the Loonatics, the reimagined Looney Tunes characters. And the Baby Looney Tunes.