full points for graphics
but for the rest, well, good attempt. but still, graphics, seriously! spot on! but, the rest... :)
the voices were good, your cartman-imitation was at least not irritatingly far away, so that's alright. the voice-acting for matt and trey wasn't anything like their real voices, but good voice acting nonetheless.
as for the joke, though... there was only one, "who is cartman's father", and well, although you added a little twist to it, it's still been done in the original cartoon itself, so...
in conclusion, come up with a better script/storyline next time, and you'll end up with pure gold.
är du finlandssvensk förresten?