This man is one of the authors I absolutely admire. His thoughts are complicated, yet quite clear. His comics are full of action and in the same time full of deep underlying messages.
However, he is sometimes very ... controversial. In this document, he tries to explain his thought on magic, his thought on the modern, commercial world, and he talks about how he became a comic writer.
This document is strong in moments, when there is only Alan speaking and telling his story. But when the author of documentary tries to use his own approach, the film became boring. So yes, we will see Rorschach on the roof - and it is the most boring Rorschach I have seen. The music is also inappropriate and special effects are laughable (yes, there are special effects in interview. don't ask me why.)
But the interview with Alan is really worth watching this documentary or buying it on DVD.