Just came back from a second viewing and I must say I enjoyed it even more the second time. Anyone who thinks the movie lacks depth or emotional resonance is not paying close enough attention. I can't help it: tears spring unbidden to my eyes when John talks about "oxygen turning to gold" on Mars, and again when Rorschach begs for death in the snow. And, for the first time, I actually felt pity for Veidt: his slaying of millions, and destruction of the world's main centers of power and art and commerce, will weigh heavily on his mind and heart, even though his deeds saved humanity. The novel may have packed a greater emotional wallop, but that's true of any extended reading experience that gets distilled down into a two-and-a-half hour movie. Literary source material is always going to be more affecting because it is an immersive and collaborative (with the reader's imagination) art form. Looking at the film as a film, comparing it to other works of its genre (including the broader sci-fi genre and the more narrow superhero sub-genre), this thing is a genius-level tour-de-force of epic proportions that will be talked about for decades to come.