So why did I still give it a 7 out of 10? Sounds a bit too much and I won't argue with you, if that is how you feel. However there is some redemption towards the end of the movie. While it is mostly predictable, the over the top ending kind of almost saved the day (no pun intended).
As I stated above in the summary line, characters do act weird to put it mildly. They do things that the viewer should be dismissing. And while it is imperative for a horror movie, that characters do certain things so the story moves forward ... it doesn't help if the characters who are doing those things are of questionable character ... some may call those characters despicable. I wouldn't go as far, but likeable is not something you can attest to them. Until maybe you learn something about their past ... if that changes you perspective, fine, if not you will have many issues with this. Still the scares are right and it's decent overall