Ok, not being a South Park fan at all, I was pretty much "meh" towards this idea. That said, I like about 80% of it...but there are times, like "Hasa Deega Eebowai" where it feels like they are trying to be funny, and for me it looses itself.
That said, I love the musical references, and most of the score. Not sure I have any interest in seeing it in person...but the album's enjoyable enough.
http://www.youtube.com/huskcharmer