I know I'm going against the grain, but it didn't really grab me. His wildlife program was a bit like that as well for me.
I think I was expecting something a bit more focussed on individual subjects, like each episode of his Northern Wilderness series. This just seemed a bit more skimmed across his covered subjects.
Just as a side note, does anyone remember a documentary from the 80's about delinquent kids in America, getting the choice of going to juvenile detention or having to take part in a trip acting as cavalry troopers from the 1860's, that took a few weeks. That was very interesting at the time.