I like this talk a lot. Condensing such a big story into such a small talk—all of the background information, the biographies, the infinitely complicated context—for a diverse crowd of mostly first-time visitors, is an art form. Some do it better than others. Steve Adelson does it very well, I think.
[My only (nitpicking) gripe about the presentation has to do with the video editing. There is no known photograph of Crazy Horse, but this film seems to suggest that's what you're looking at on a couple of occasions.]