How bad is it? It's probably the worst horror film I saw in 2009.
Should you see it? Nope.
Molly's mother is in an institution for trying to kill her with a knife and she tries to start over at a new school. On her 18th birthday, her mother escapes and tells her that she (Molly) died when born and that a deal was made with the devil to save her, with her soul being turned over at age 18. Molly has nosebleeds and hears voices, which turns out to be a brain tumor, but of course isn't. Not much happens, though Molly does break a guy's arm at a party. The film has an unsavory religion-as-we-cram-it-down-your-throat mentality that will turn off most.