I really appreciate Herzog as an artist. I think Grizzly Man is a unique piece of art, and Herzog's commentary is an integral part of it - original, and very worth listening to.
Tonight I was planning to watch either Fitzcarraldo or Aguirre after having listened to Herzog on the Freakonomics podcast earlier this week. But after hearing about the book there, I was really put off by some of the things he said and concluded that the book would be a hard pass for me. Nothing persuaded me that he had anything interesting to add - neither rationally, nor aesthetically - about a topic which has been extensively covered by very diverse thinkers throughout the millennia.