I also saw this on PBS the other night. Pretty good. I enjoyed the dance segments, but not, as Jack Reed has already noted, the voiceovers that often continued all the way through them, so much so that regardless of their value as observations I began to wish I could just hiss “Shut up!”
Sometimes it's not up to the film director and producer to air the footage uninterrupted. When the permission to use the footage is granted, it may attach a condition that the footage be adulterated, i.e. with voice over.