“Green Room” (*1/2 out of four) was a pretty lame horror thriller about a punk rock band who witness a murder at a tour stop in a remote club and are then menaced by a group of maniacal skinheads and the club’s owner (Patrick Stewart). But it’s much more of a slowdown than a showdown. Many horror fans praised this movie but I’m not one of them. One scene of a band member getting his head blown off provides the only jolt in the film. Despite the lurid premise, it’s dreary and forgettable.