The movie had good cinematography and good acting. I don't remember having seen quite a similar story in any of the horror movies I have seen so far and I have seen many, so I would say some aspects of the story were original. Many ideas had been taken from movies such as Mirrors, the Unborn and other run-of-the-mill horror movies, so those scenes only served as a filler and didn't scare me at all. It did give me chills four or five times, so it wasn't a complete waste of time, but it didn't develop the scare factor as much as it could have, which is a real let down. The movie had potential to be really scary and leave you with lasting fear, but it was ultimately a failure.
What really annoyed me were the lead actor and actress. While they delivered good performances, they didn't have the looks. When I looked at their facial expressions, I couldn't help but yawn, and this is bad for a horror movie that demands your full attention. I think what actors and actresses look like is important and they can make you love or hate a movie and not be really able to explain why you feel that way. The characters were also not as developed as they could have been. We could have been told a lot more about the wife's sister, the evil entity and what it really wanted, its motives, the mysterious woman and her warning, the origins of the entity and the box, the reason for what the husband did at the end of the movie, etc. All in all, the movie left a lot to be desired. What you're going to get out of watching this movie are a few chills and wishing it had been directed by Sam Raimi. Now, he could have made this into a real horror movie.