Not Scary, But Not Its Fault...
First, let me say that this was a VERY well done movie! The writing, the acting, the way it was shot, it was a nearly perfect film.
That said...I'm sorry, but there was nothing unique about it.
It's definitely a genre film, & there's nothing wrong with that. But it's too much of a genre film. If you've ever seen a home invasion film, even an awful one, you've essentially already seen this one. There was nothing to set this apart from the rest, other than the overall high quality of the film itself.