Bram Stoker made them literature, then Anne Rice creatively deemed them worthy of formal interview. We've been taking them ever more seriously ever since. (I'll admit Kate Beckinsale still has permission to suck my anything.)
Perhaps, the critics are less concerned with "accuracy" than the wrath of that other dual-natured creature: that mix of beauty and foolishness which is a teenage girl. Her whim can make a boy's, a writer's, or a movie maker's dream come true. Yet, she isn't always the paragon of good judgement. (Any doe-eyed hottie producing an actual vampire or werewolf will receive an online apology and a free book from me. Put up or shut up.)
Those who don't take vampires or werewolves too seriously may enjoy this visually-pleasing, fast and fun whodunnit. Those who find "inaccurate" portrayals of the nocturnal ones offensive should seek professional help. "Over the river and thru the woods to grandma's house we go...."