Suntimes: I bought the DVD of “Troll 2” because a friend advised me to see it. “You're busy,” he told me. “You don't have time to see every bad movie. So you might as well see the worst of all time.” Yes, “Troll 2” has a coveted zero percent rating on the Tomatometer: the lowest-rated film ever made. A critic could become the most-hated person in fan circles by awarding it even half a star and spoiling the perfection of that zero.