I've watched this thing at least a dozen times since I got it.
The beauty of this disc is how much information it captures, how close you get to look into a day in the life of the Foo Fighters, over the course of 16 years. The ups, the downs, the fights, the drugs, the comfort and pleasure of rock and roll.
To see the motivation, and the enjoyment, what helped to create some of their best songs and albums and to see them pour even more passion into Wasting Light. I've watched this with other long-time fans and people who have never(unbelievably) heard a Foo song and everyone enjoys it just the same.
As a pure documentary it is enjoyable, as a fan it is thoroughly entertaining.