This film has been criticised too harshly, because of Mick Jagger's lack of experience as an actor and it's failure to stick to verifiable facts. But treat it as the cinematic equivalent of a folk ballad and you'll have a good time with it. Just as you wouldn't hire an opera singer to sing a folk song, you don't need a professional actor to play the lead in a rough-and-ready entertainment about a rough-and-ready character. By the time one gets to the speeded up segment that accompanies Waylon Jenning's singing of Shel Silverstein's "Blame it on the Kelly's" it becomes clear this is not a film that is intended as a serious examination of history. Like the song "The Wild Colonial Boy" which Jagger sings in one of the more memorable scenes in the movie, this is popular entertainment to be enjoyed with a few beers. Taken as such it is very enjoyable, with catchy songs, evocative cinematography and Jagger being very much the lovable, charismatic rabble-rouser he was in real-life at the time. And what matters in a folk ballad is not the truth, but the legend.
