Do you like Elizabeth Olsen?
I think part of how much you'll like this movie will be dependent on how much you connect with Sarah. I found her so easy to connect with even without back story because Elizabeth gives such a strong and convincing performance. I was completely invested. So even when she made some unfortunate decisions, I wasn't critiquing her, I was just hoping she'd be all right.
She's a great actress and it was impressive how she carried this whole film, and it's only, what, her 3rd movie? I look forward to seeing what she does next.
I wrote more about the actual movie in my review, if anyone wants to read it:
http://www.smallnic.com/?p=579
I'm the Antichrist. You got me in a vendetta kind of mood.