Filed under: Documentary, Music & Musicals, Sundance, Theatrical Reviews, Festival Reports, Cinematical IndieBetter to reign in hell than serve in heaven. -- John Milton, Paradise LostI'd rather be a king below than a servant above. -- Anvil, '666'... Which is all well and good, but what about serving in hell? Anvil! The Story of Anvil is not just better than you'd think that a documentary about a 30-year-old Canadian metal band led by two lifelong friends in their 50s to be. It's better...