Get something straight up front - this is a movie, not a documentary. It will have errors. Get over it, move on.
As a whole it does well to bring to life the schizo genius/idiocy of the roots of black metal. It is ~90% accurate which makes it leaps ahead of most docu-dramas. To the unwashed, this may seem like a parody of sorts. But the reality is that the main players were a fringe crazy that was beyond parody. Yes, they were all probably like that and the film understates it if anything.
Black metal is a thing. Yes there is a point about the desecration of Asatru shrines. No it does not justify anything. If the film does have a flaw it is in emphasising satanism and odinism - no, their thing predates that. It is otherwise a fine retelling, Don't listen to the _Mayhem_ cultists. This is a good movie.
