First of all, let me preface this by saying that I am not a huge fan of South Park the TV show. While I find the TV show amusing, I do not watch it more than once every few months. So I had doubts about the movie, but my brother insisted I watch it. So I did and ended up purchasing the DVD the next day.
All comedy aside, this is one of the most masterfully written movies I have ever seen. The songs are hilariously funny and the way that they incorporate all the individual songs into one masterpiece is sheer genius. Probably one of the best musicals I have seen.
As for the humor, don't watch this if you are easily offended, because you will be offended.
Funny, funny, funny. 10 stars.