I just saw this at the Alamo Drafthouse, and I was surprised at how much I enjoyed it. It is probably the most watchable movie on the topic thus far, as it actually has a budget and properly addresses the many subgenres. It stays focused on the more populist bands (Wacken is a prominent setting) but I find that getting into all the underground minutiae bottoms out these days because whether people are motivated by commerce or popularity, the effect on the music is just as deletrious. Sam Dunn, the filmmaker, is a contemporary of the 1980s metal (30-ish, grew up on thrash and death metal, cites Autopsy as one of his favorite bands) so it is worth supporting and good fun. The interview with Gaahl and then Dio repeatedly ripping on Gene Simmons are worth the price of admission.
by David Anzalone