I just saw this tonight. I thought it was a really good movie. I suspected that the trailer was only showing about 0.00001% of what the movie was about and was right. It's more a court room drama than horror. Very well done.
Disclaimer: I have a wide range of movie tastes and it may not relect main stream views. I highly dislike main stream movies.
I usually don't get that scared in horror movies. This one scared me, and I have to say if I ever wake up at exactly 3 am I will be up the rest of the night.