I found this documentary to be riveting to say the least. As a blues fan for well over 20 years, I learned more from this 10 part mini-series than I have anywhere. It was great to hear some of the original blues artists in rare recordings that I would never have otherwise discovered.
Someone commented that they wished there was "more music and less talking" but then want on to say he/she wished there was more "documentary" as well. I'm not sure how you can do one without the other, but while I too was sometimes disappointed when they ended a tune to cut to someone talking, I think overall, it was a terrific balance. The series is after all, a documentary, not a VH1 music video! Hearing some of the olde thyme greats speaking of the old days, was compelling to say the least.
I highly recommend buying the boxed CD set as well (then you get to hear all the music).