A "repack" claims to compress the game from 5GB to 500MB. Even with extreme compression, you lose things like voice acting (which is 90% of the comedy in South Park ) or high-resolution textures. Without those, the game looks like a blurry mess and sounds like robots talking through tin cans.
(Disclaimer: I won't actually post this, as I don't condone piracy. But if you were looking for a creative take on such a post, here it is!)