The saw blades match the thrills in blunt rustiness throughout the uneven, but not entirely awful, Texas Chainsaw 3D. Positioned as a direct sequel to Tobe Hooper’s gritty 1974 original (and thus ignoring several other sequels and remakes), TC:3D picks up decades after Leatherface’s first bloody rampage as yet another group of sweaty twenty-somethings wind up at his backwoods home. Flesh is soon displayed, then flayed. Alexandra Daddario and her impressively toned midriff get a good workout evading all the chainsaw carnage, but sadly there’s nowhere for her or the story to go. Some late-to-arrive plot twists, which switch up the scares for grindhouse revenge plots and some smokey, saucy Texas-style vigilante justice, are welcome but too little and too late. Horror formulas, like bbq recipes, can be hard to alter. Maybe next Massacre.