Scott Cooper’s bleak and atmospheric drama about real-life Boston mobster Whitey Bulger ushers in the 2016 awards season. It features a startling dramatic performance from Johnny Depp whose recent appearance in a spate of average movies from The Lone Ranger to Transcendence makes Black Mass especially gratifying. Depp’s pale, balding crime boss is an alarming sociopath. Masking his propensity for violence with a polite public image, Depp’s Bulger is well-liked in the community even after a stint in Alcatraz. The graphic acts of violence won’t shock anyone familiar with the work of Scorsese or Tarantino but by turning his camera upon the faces of complicit onlookers Cooper (Crazy Heart) ensures their weight is felt. In spite of 2015’s finest comeback, Black Mass doesn’t get…