"The Dark Knight" is such a moody, dramatic, dead-serious affair that it feels more like a noirish crime thriller than a superhero movie. Everything in the movie is played straight and aimed at grown-ups (or at least older kids). There is no geeky joy in Gotham City, no trace of the gee-whiz wonder most comic-book pictures trade on for effect. At times, when Batman pops up onscreen in all his ...