Good work, but the animator could do better.
I'm probably going to get shot down, but here's my review.
Awesome thing, but the part thats awesome about it, in my opinion, is the song.
The actual video IS awesome, but I can tell from several spots that the animator obviously has much more skill, and just didn't put as much effort into it as I think he could. (Or, if you didn't draw the stuff, find better artists =P)
Whatever the case may be, I give the overall for this a 9. Its simply awesome, the animation is hilarious (though I still think could be better drawn), the song is one of my favorite things, and I like how it was assembled. Timing, etc was all well done.
Only piece of advice could be, if you want to make it THAT much better, spend a tiny bit more time on your artistry. Shaq's Face, Aaron Carter, and a couple others just looked kinda iffy.
But again, this is in my top 10 animations. Simply awesome.