Why is he naked?
Quadripeligics don't have to be naked :P
Animation was smooth, almost too smooth in some places, as in lacking energetic motions, mostly the characters kinda 'morphed' between various poses, rather than appearing to actually have momentum and inertia. Try squashing and stretching your movements a little more :)
Curly's voice is REALLY nasly and weird in his first line. In his second, he sounds completely normal. It's kinda weird.
For some reason, Wavy's pose when he says "Who wants to go to the beach," looks REALLY weird, probably because he doesn't actually put his arms behind the other characters, and he seems incredibly large compared to both of them.
Overall, it was good, but a little more effort/'omph' put into it would really make it nice, I suppose that would've happened if you had a little more time to work on it :P