I saw this movie only a couple of hours and really, it seemed to me very good, but it was a surprise to see so many bad comments about it in IMDb. I believe that the movie was thought-out well, there were moments of anxiety and failure where you felt intrigued, and desired to know what would happen then. May be there were some things out of sense or mistakes, etc,..but, of course, nothing is perfect!. It wasn't as bad as some people think. The script was good, the MF performance was outstanding, and the plot was disturbing. I had a good time, don't let that all this comments make you change the expectations about the film, this time you have to see it and give your own opinion.
I recommend...rent it.
I recommend...rent it.