Is no one gonna point this out..?
This video is hilariously amusing, your art style works really well with Team fortress 2, you should consider making more TF2 themed movies.
HOWEVER! I see a few flaws in your animation and art, some of your animations from the start to the halfway point seem to skip a bit, as though you skipped out on a few frames, but since you made this in 4 day I guess I can let that slide... What kills me the most though (in a bad way) is the scout, the way his head is drawn as well as the stretch marks in the expression on his face (after he says "this did not just happen") makes him seem as though hes the oldest guy on the team.