“Depravity” (*1/2 out of four) was a leaden horror melodrama about three roommates (Victoria Justice, Sasha Luss, Devin Ross) who accidentally kill a man (Dermot Mulroney) who they suspect of being a serial killer and their individual guilt kills all of them and turns them against one another. Heavy on spooky atmosphere but everything else about it is heavy as well and dull. Quite a genre change for writer/director Paul Ramsay who previously wrote the “Air Bud” series.