This is a movie that grew on me. When I first saw it in the theater, I thought it was just OK. But with repeated viewings, somehow, I came to enjoy it more and more. The utter absurdity of it all first put me off, but once I embraced it, I loved it. And of course, there is the music: James Brown, Aretha Franklin, Ray Charles, and great sidemen like Steve Cropper and Duck Dunn. Lots of memorable scenes and lines: "How much for the little girl?" "I hate Illinois Nazis." "Are you the police?" "No Ma'am, we're musicians." And of course, "We're on a mission from God."
I still think it is overlong and excessive (car crashes anyone?), but I'll stop and watch it any time. Oh, and I have the DVD too, which has gotten some play.