Black metal is atmospheric, but this movie lacked in this department a lot. Black metal is cold, dark and chilling, this movie was confusing, boring and shallow. The story was very 'too Hollywood'.
If you want a good black metal feeling, go and watch Málmhaus [2013], but don't spend time with this one. Better watch Varg's Youtube channel.
Only good thing was the end credits, which appeared in reverse order.