Whatever your subjective opinion, this is undeniably an impressive work of low-budget showmanship. James Wan and Leigh Whannell conjured an entire mythology out of a dirty bathroom, a couple rusty hacksaws, and some creepy dolls. The whole thing is just a series of people in rooms, telling stories within stories; a man describes a killer he heard about, and then a survivor describes her experience, and so on. It should be stultifying. (Danny Glover looks kind of bored, to be honest.) It works because of Wan’s precise, energetic direction, and the genuine, sadistic cleverness of Jigsaw’s “games.” In hindsight, it’s not shocking that both of the main filmmakers went on to huge careers.