This is what horror should be. Movies that are upsetting but have a moral message and to be unique in it's own way. This movie nails both on the head, except the pacing on this movie could of been better. The movie does drag at times. But for the most part it's pretty good.
You know, i was never really a fan of Slashers like Friday the 13th, because both of those films are pointless, and it's just horror for the sake of being horror. Neither of those films have anything unique, it's just the same idea in circles.
This movie however, has a great message; Faith and do not mess with the other side. I would say that this is one of those movies that Teenagers should watch in school alongside Requiem for a Dream, and Apartment 407. All 3 films i just named have great messages, and they really make you think about life.
I can also say another a bit negative is the effects are kinda weak. But i did not really care because that's not the point what makes a good movie good is a good story, and pacing. Everything else can be passed.
Even the father becomes likeable in the end, the man realizes where he went wrong, and follows the footsteps of his daughter and son. I can totally recommend this, with other good horror movies like: Chucky, Martyrs, Cannibal Holocaust, Uzumaki, Hostel, Dead Alive, Reanimator, Cube, Saw 2 & 3, and many other great films out there...