The contrast between this new version of "Dawn of the Dead" and the 1979 George Romero original is instructive in the ways that Hollywood has grown more skillful and less daring over the years. From a technical point of view, the new "Dawn" is slicker and more polished, and the acting is better, too. But it lacks the mordant humor of the Romero version, and although both films are mostly set inside a shopping mall, only Romero uses that as an occasion for satirical jabs at a consumer society.