It was so short but that shouldn't matter.
I judged it on what little I seen, I just assume that a bit of work went into it and I believe inless its complete and I mean complete crap it should be blamed and it wasn't so I vote 3 and review overall 5 based on it being pretty good and only a demo (half finished at that).
I've seen better, but I've seen worse also. Just because it was south park I cut you some slack. One thing that was good though, REALLY good was that Cartman voice. If you did it??? It sounded so identical to Cartman I'm not sure if it was you or Trey Parker himself.
I may need some voice talents for some future south park episodes I'm planning on making. If you wan't you can do the Cartman voice.