Graeme; I think it's amazing. I learned a lot from it; plus, it is so well put together that, for me, it's very enjoyable viewing. Burns' team meticulously revived old archival footage, bringing it alive to help tell the story. It really does tell the history of this music in that you can see the evolution over time.
There are reasonable criticisms, especially over musicians left out or glossed over, and others for whom too much time might have been spent, and the choice of expert commentators, etc; and some have found the last chapter on current day developments somewhat lacking. But overall, an amazing work, and a great resource.
I hope you like it.