In my opinion, critism is basically telling you how to improve a little rudely. I mean, think about, saying that it's choppy, and saying that you need to be more smooth is pretty much the same thing. You notice it more when you be crit, but to be nice about it, you compliment and tell what to do.
What zomb did was pointing out the bad things. You can stilll learn from that, but not as much from a real compliment, crit, compliment.
The animation had a nice touch to it(compliment), but it just wasn't animated too well(crit). It was smooth and all(compliment), but it was really stiff at some points, and kind of stiff in other places(crit). You have most of the movements down(compliment), but some need a little work(crit). The second was a bit smoother(compliment), but had barely any movements at all(crit). The body shakes were a nice touch, though.(compliment)
^example of a GOOD comment... it's also my real comment on the animation, lol^