This may contain MILD spoilers.
I like good horror/suspense movies in a genre which is full of PG-13 Asian Horror films that are Americanized or complete torture porn such as Hostel.
I was hoping this movie would be different. Unfortunately, the director simply wants to make a point about violence in movies. He basically is stating that people that enjoy the violence are sick.
As for the movie itself, it does have a good performance by Watts and overall the acting is good. However, it builds no suspense and breaks the cardinal rules about films. The characters talk to the audience and uses a remote control to change the events of the film.
I don't know who movie would appeal to. It does not have much violence for the gore hounds and I don't find a couple of psychopaths torturing a family (all off-screen) to be entertaining.
The movie has no suspense, humor, violence, and only a message that violence is bad.
I personally am not a gore hound but I do think the director does not give people enough credit. People know violence in movies are make believe. Why waste 2 hours of peoples times trying to make a social commentary against violence in movies? This movie is nothing more than a waste of time.
My recommendation: Go Rent (or Buy) Stanley Kubrick's A Clockwork Orange which covers similar territory but in a much better way.
Dean