This is a great introduction to the history of comic books and graphic novels. Anyone looking for an indepth study should just avoid this documentary as it is really targeted at the newcomer. And yet for hardcore fans of the old classics, this is worth a look as well -- if only to see and hear great artists like Jack Kirby and Will Eisner reading from their works.
The film is a little rough around the edges technique-wise but this gives it a certain low budget charm. There is also a whimsical sense of humour that really works well.
My only gripe is that Ron Mann didn't interview Alan Moore! A huge omission, in my opinion. That, and I wish he would've had more of Frank Miller but that's a minor quibble at best.
Definitely worth a look if you are interested in the history of comic books.