Finally got a chance to watch this and enjoyed it. The director did a nice job of conveying the arc of Lucas' progression as a filmmaking force and capitalist. I agree with others that at the end there was a sudden change of tone, but that's better than ending on a "F U GEORGE" type of note.
I definitely liked hearing from Prowse and Kurtz, and Gaiman was a nice touch as well. All the interviews were very entertaining and thoughtful.