The plot is simple, but reveals pretty much what is going to happen. As I don't want to spoil the movie for others, it's enough to say that 1 out of 700 people that undergo surgery find him/herself awake during the procedure, but unable to call for help.
If I divulge anything else, the script itself becomes obvious, so because of that, I found there were no surprises, no twists.
The acting sucks! Only Lena Olin is worth watching. Hayden Christensen and Jessica Alba are mind-blowingly bad. And Terrence Howard is possibly worse.
I found the premise very interesting, but it was, in my opinion, badly scripted - there are several plot holes.
Interesting to watch for the story, but no other reason really.
5/10