As far as her recent movies are concerned, only one thing separates a good Melissa McCarthy comedy from a bad one, and that thing is Paul Feig. (Those awkwardly unfunny previews for Feig’s forthcoming Ghostbusters reboot, however, make me wonder how long that’ll be the case.) In the director’s Bridesmaids, The Heat, and Spy, McCarthy has been a blistering and wonderfully human riot, but the films themselves are so solidly constructed that you know they would’ve worked even with someone less naturally gifted in her roles. Yet the same can’t be said for the dismal Identity Thief, or the tonally nuts Tammy, or the debuting The Boss, which finds McCarthy’s ex-con entrepreneur Michelle Darnell seeking redemption through a makeshift Girl Scout troop, homemade brownies, and excessive bullying techniques. In each one, when she isn’t being humiliated, McCarthy is the best thing in it. In each one, that’s hardly saying much.