For about 20 minutes. After that the laughs were few and far between. South Park, the tv show, can barely make me laugh twice during its half hour. So, in one sense, the movie was a total success. Many of the laughs come, of course, from the songs.
Plot is silly or nonexistant.
Most irritatingly, the 'film'-makers are so intent on getting to the next bodily function joke or next 40 occurences of the word 'fuck,' that they miss many many obvious and potentially hilarious jokes. Which shows that these guys really don't have a great sense of humour or any intellect whatsoever.