First off, this isn't a horror or slasher movie. It's a violent suspense thriller (without the thrills).
There are some tropes that will be scary to some but overall this just isn't a good movie. If the protagonists being absolute fricken idiots (to the point that you barely care what happens to them) really bugs you, you won't enjoy it either.
That said, if your only requirement for enjoying this kind of movie is good acting, some decently creepy camera shots, and a good amount of tension you'll enjoy this.