I wanted to see an old-fashioned scary movie without teenagers (so no 'Scream' or 'I know what you did last summer'-clone). And Gothika delivered.
Sure, the story was not very original (psychiatrist becomes psycho) and the horror effects were quite predictable (be careful! behind you!) but when I left the cinema and went back to my car, I closed the doors careful. And now as I am writing this...i'm looking over my shoulder to see if there is nobody behind me in the corner...so the movie worked!