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“300” is about as violent as “Apocalypto” and twice as stupid. Adapted from a graphic novel by Frank Miller and Lynn Varley, it offers up a bombastic spectacle of honor and betrayal, rendered in images that might have been airbrushed onto a customized van sometime in the late 1970s. The basic story is a good deal older. It’s all about the ancient Battle of Thermopylae, which unfolded at a narrow pass on the coast of Greece whose name translates as Hot Gates. Zack Snyder’s first film, a remake of George Romero’s “Dawn of the Dead,” showed wit as well as technical dexterity. While some of that filmmaking acumen is evident here, the script for “300,” which he wrote with Kurt Johnstad and Michael B. Gordon, is weighed down by the lumbering portentousness of the original book, whose arresting images are themselves undermined by the kind of pomposity that frequently mistakes itself for genius.