I agree with many here that there were major flaws in this film. It was pretty boring for the majority of the film...however, based on how thrilling the ending was, I think it was the filmmaker's purpose to numb the mind so that the scary scenes would feel more scary than if the thrill was consistent throughout. I have to confess that this did freak me out when I went to bed that night.
Be prepared to sit through some sillyness, some bore and cheese, but it's all worth it in the end.