There may come a day when someone gets a live-action 3-D movie right. It won’t be a gimmick, it won’t need to showcase dazzling CGI effects, and it will truly help bring the story to life. But we’re going to have to wait to see it. James Cameron produced Sanctum in hopes that it could showcase the affordability of his 3-D dream, but why would he choose a movie that takes place underwater and deep in caves, where light—a big contributor to providing the depth of field—is a scarce commodity? It’s certainly a worthwhile question, because without 3-D, Sanctum is really not even worth discussing. The story’s uninteresting, and all but one of the performances are wrong. The groundswell of support for 3-D is slipping, and it’s easy to see why: A bad movie coupled with imperfect technology is a lousy formula for success.