Or maybe everyone does?
http://www.southparkstudios.com/It appears to be everything including the 12th season -- is that this season? I've been going through it pretty systematically, catching up on episodes I've missed, or a few (the classic "Scott Tenorman Must Die") that just bear rewatching. I think I'm up to season 7 now.
Video seems mostly fine, although a couple episodes were oddly presented out of sequene -- the Helen Keller Musical one, for instance -- which suggests something technical over there, but who knows what. One commercial at the break points, mostly pretty stupid ("Hey, Mona! You Rule!") but hey, what do you want, huh? It's free and the commercials are blissfully short.
As for the show itself, this is one of those things I can't be objective about, I love this show with a passion and always have, it's one of my all-time favorite tv shows and one of the few comedies I've ever really liked, actually.
doug