Do yourself a favor stop reading reviews and watch this movie. Make your mind up about it and then read some reviews.
ok if you watched the movie this is for you now. WHAT A MASTERPIECE. Every Character feels real, with clear motivations. The fun comes in slowly learning everyone's motives and or driving force. This is a clear cut case on how to do a modern thriller. Don't @ me this movie will be written about in college classes for years.