When this film came out, it was a refreshing and enjoyable movie. It treats comics with some real respect and takes the time to explore the medium in some detail.
However, there are some flaws. Some of the talents interviewed do not work in comic books per se, but in comic STRIPS, a variant of the medium that has gotten much more respect over the years than comic books. However, that variant has it's own history and dicipline that is distinct from comic books and should not have been included. This is meaning no disrespect talents like Bill Griffith, but it's like having a film discussing the art and history of movies and having TV series producers interviewed. They are part of a related medium, but are really not relevant to the main subject of the film.
Otherwise, it does cover a fairly complete view of the form with giants like Jack Kirby, Stan Lee and Robert Crumb, although I would have liked to have seen talents like Alan Moore (Swamp Thing, Watchmen) or the Pini's (Elfquest) being interviewed. The animated sequences were a neat way to get the atmosphere of the comics in their different eras as well as the major characters. The footage of the pages from "Batman: The Dark Knight Returns" was particularly effective.
In short, if you need a quick overview of the comic book as a form of art, then this film is well worth your time.