Suppose you created a gorgeous CGI world with breathtaking 3-D vistas and amazingly life-like aliens, and then you drop in a formulaic story, wooden actors and snooze-worthy dialogue? You get James Cameron’s Avatar (C), and I want my three hours back. Actually much of the action is rousing and many of the creative sci-fi effects engrossing, but the epic polish largely conceals that the emperor of the world is sporting a threadbare ensemble.