Rev. Billy is on a mission to reduce mindless consumerism, which is a noble and probably impossible goal. He's a very charismatic figure and even though his reverend persona is meant to be humorous, one can't doubt his absolute sincerity and dedication to his cause.
He's a great character and he comes across as exuding a terrific natural charm on screen. He's a man made for the media if anyone wants to heed his call.
The film veers a little off track, though, when it sets up its story as a road movie about Billy and his choir traveling across the country to prevent the Shopocalypse. But rather than follow the road movie format, the film's broken up by traditional documentary title cards that halt the flow of fun. At times it even gets confusing what city and state Billy is even in.
It's a fun documentary, though, through the sheer force of Billy's personality.