Here's an example of what your teacher was trying to say that isn't completely slow and boring:
<a href="http://www.youtube.com/watch?v=OkykBaUxGB8">http://www.youtube.com/watch?v=OkykBaUxGB8</a>
Also 3D isn't a medium.
You're ON TO SOMETHING here, but I think you've missed the real point. The things you're talking about are like goofy lil gimmicks. It's something you can only do in cartoons, technically, but it's not what cartoons are good for or best at.
What you should read, buddy, is JohnK's blog on "specific acting". John Kricfalusi loved cartoons for the sake of expressing thoughts and emotions through the shapes of the characters.
<a href="http://johnkstuff.blogspot.co.uk/search/label/specific%20acting?updated-max=2011-10-21T16:37:00-07:00&max-results=20&start=2&by-date=false">http://johnkstuff.blogspot.co.uk/search/label/
specific%20acting?updated-max=2011-10-21T16:37 :00-07:00&max-results=20&start=2&b y-date=false</a>
He knows cartoons can be WAY better at this than anything else, and would twist n squeeze dudes into pictures that speak a thousand words. He's a big fan of classic actors who are the closest thing to this in real life.
He HATES cartoons that don't take advantage of it, and it's like "why did you bother animating this if everyone's gonna be so stilted?"
So yeah: You'll like reading about that.
Kajenx
They didn't like it? It's funny, what else does it need?
People think too much about art...