[7] Precious is the kind of movie a studio exec must dread hearing a pitch about: “So, there’s this girl, and she’s really sad, her daddy raped her, she named her down syndrome baby Mongo, her mother violently abuses her, she’s HIV-positive, and, yeah, it really sucks to be her.” Surprisingly, Precious doesn’t wallow in melodrama. It plays straight-forward and honest, and you really start …