Opening this weekend: The Gentleman—Matthew McConaughey plays Mickey Pearson, a wildly wealthy weed kingpin in the UK. By virtue of the fact, which Mickey himself points out, that his illicit product doesn’t kill people like heroin does, he’s the least despicable boss in this latest of writer-director Guy Ritchie’s gangster comedies. Mickey would like to divest himself of his massive subterranean pot empire and live the life of a gentleman, so he makes an offer...