"That Guy...Who Was in That Thing" is a great documentary for film buffs but is probably something that the average person might not care to see. But, since I love films, I love the idea of learning more about some of the familiar supporting actors that are ubiquitous--the guys whose names you usually don't know. The movie stars about a dozen of these folks who talk about a wide variety of topics. And, since there is no narrator, the film seems, at times, a bit directionless--more just musings about their lives, careers, the ups and the downs. This same lack of direction does, after a while, make the film seem a bit overlong--though still interesting if you can stick with it.
By the way, I would love to see a sequel--one in which they progressively give the actors more and more and more alcohol in order to find out what they REALLY think. Also, interestingly, no female actors were interviewed.