I have read that Jennifer's Body was one of the first screenplays Diablo Cody wrote. I understand most writers have a horror story in their portfolio. Word is, she used her Oscar clout from Juno to get this film made. I'm glad she did. Basically, Jennifer meets up with some unseemly characters that unwittingly turn her into a man-eating demon. The characters are recognizable, the rules of the demons are clear and the execution is decent. Though it had it's cheesy moments, they gave the film a certain charm. I enjoyed it.
An interesting side note; there was a sign at the box office of a theater in Warwick, warning patrons that there was a scene reminiscent of the Station nightclub fire. A local wound that is still very raw.