so its not great, its good you put the effort in.
the first thign you need to consider when doing something like this is to make the song and video sync a bit, changes in the song = changes in the flash. Something simple like that will make a big difference. The other thing is, although it's good you used characters and not sticks, they need more animation, especially in the mouths, it looks terribly forced when the mouths have only two states: open or closed, if not, at least sync the mouths with something thats being said, to make it a bit easier on the eye.
Anyway, its not a bad try, love the song, (DJ Gotcha i think, might be worth crediting him?) Kepp tryign and you'll get there sometime.