Not bad.
The bad: Animation style is a little too tween-heavy, the pacing is rather off, and you should've faded the Harry Potter theme out, because it didn't really match the scene very well after a certain point.
The good: There were some very funny moments, the dialog was sort of amusing in an odd, vulgar kind of way, the voice acting was well done, and the art was above average, and consistent.
Verdict: It's not perfect, you should work on your comic timing for the next one, but all in all it's worth watching. :)