I'll say it straight away, this film is about tooth fairies and if you can't bring yourself to get spooked by that then this film will lose you after 5 minutes.
If you do decide to give it the benefit of the doubt you will be sorely disappointed. This film is a tired ball of horror film cliches that manages to squander every interesting thing about it long before the half way mark.
It confuses building suspense with large periods of nothing and drops in some faux symbolism early on that amounts to nothing, and any suspense it does manage is undercut by music playing constantly throughout. The periods of silence in the film could be counted on one hand.
Although stupid decisions are par for the course in horror films some of the actions in this one require far too much disbelief than most people can manage. The father, in particular, is written so dumbly that it makes him unlikable, much like most of the cast. They have nothing particularly notable about them and Sally seems the best developed of any of them but damn is warming to her hard. At least the audience sympathises with Kim on that.
I'm amazed this is a 15 rated film because it feels like a Disney Channel production. Once the creatures appear it loses any shred of credibility with awful CGI (They used CGI on a metal rod!) and the scariest moment in the film is in the trailer. The monsters whisper menacingly but bar one moment (which I imagine they snuck in to get the rating) DO NOTHING. They have no sense of threat at all. That the main page describes this as terrifying boggles me.
The very worst thing about this is how boring it is. If any of the above things could be forgiven it would be because the movie was enjoyable on some level, but it really isn't. This film will bore you into sleeping and the music will keep you awake to sit and suffer.
If you want to watch a creepy film about a girl exploring her new house while her parents are too busy to pay attention to her and meeting some untrustworthy creatures who want to keep her, try Coraline.
I would rather watch Darkness Falls than this.