I wanted to watch this movie when I was thirteen and really into Metallica. I didn't get a chance to until very recently. I think my thirteen-year-old self and I would disagree a lot about this movie and about the members of Metallica during this period of their lives.
There is nothing more gratifying than watching self-serious machismo exposed for all its petty disfunction and buffoonery before the camera's lens. This movie is a spot-on depiction of the opposition between mass media expectations, capitalist interests and "art."
I liked the movie. But that's because I'm a huge Metallica fan, and I really enjoy watching movies including these guys. The movie really goes deeply into the personal life of these 4 musicians. I found the movie really interesting. I would recommened for the fans, not so much for people who almost never even heard about Metallica.