Make an effort and go to the cinema to watch it. One of the better horror/sci-fi movies I’ve seen in a while. I’m not actually sure I would classify it as being overly horror, compared to a lot of the current generation of horror/slash movies, but it still manages maintain a decent amount of tension. It’s not a classic, but it’s a good ride, compared to Surrogates though it’s a masterpiece.
Edit: If you do go and watch it, then let me know what you think. I mean I still find it amazing that some people thought Transformers 2 was good, whereas I thought it was a load of special effects laden drivel. So it just shows how different peoples opinions can be.