I've seen only the episode on Wonder Woman and it was great. The documentary goes back and provides great archival footage of the people who developed the original story line, but more interesting, it provides a look at the times and how this interacted with the people involved. They follow the history of Wonder Woman and the evolution of the character, and along the way they are many talking heads who provide a context in which to view the people and the comics.
Review of Secret History of Comics
