Errol Morris' First Person: The Complete Series 3 Pack Reviews
The style of direct questioning employed is very effective at illuminating the subject, and generating interest even in topics I wasn't partial to.
The first season really started well but some of the shows began to sag near the ending. Again though, I don't feel it is indicative of any quality variance as much as it my particular viewing interest.
It is the nature of it to rely upon said interest and that would be hard to sustain beyond the once, so that is why it gets the '6'.