I love it too. Bruce seems to offer insights into a totally different way of life without ever sounding disgusted/condescending/horrified/shocked or similar, which even the best of "travel" presenters sometimnes manage to do (yes, even the great Michael Palin, who has been known to "giggle nervously" when confronted with something out of the ordinary).
My only criticism is that the new series consists of only 3 programmes ..... I'm sure there were 6 before ?
The blood thing I can remember being taught about aged 9 or so - I think, in relation to the Masai. A great renewable food source !