Actually it seems, that you don't have to, but I think you should. Again this is a documentary that has a specific target audience and most people who are not into independent movies (or the wave of them coming out of America a few decades ago) won't like it. As you can see in some of the other comments on this title.
I respect their comments and their views. I still have to disagree with one of them, which goes a bit too far and does imply something, that the movie does not do or try to do. This movie is not glorifying the filmmakers from that time. Quite the contrary, sometimes they are shown as complete lunatics. But that is the appeal of the movie. It does show you people as they are, without judging them. The judging comes from within the viewer.
And while I have to admit not being a big fan (and also not knowing many) of the movies, I really did enjoy the movie. I liked the way it was shot and I liked the interviews. The pacing was great and the shots were interesting. And that was all before the lovely director came on stage and talked a bit about the movie. Unfortunately I had to leave and didn't have a chance to talk to her. But I hope to see more of the team behind this (her "partners in crime" were there too).