It was a really chilling movie. I loved it though. It took me a while to understand that our good friend Anton, the psychopathic hitman, was actually the main character. He was an antihero, but he was in fact the 'protagonist' whereas the movie was actually filmed from the narrative point of view of the sheriff, who was basically using the whole series of events to show how much the world had changed from when he was a young man. The ending, with Anton walking away, basically gives you the sense that this is the world we live in, and it is not going to change that easily.
[/artistic interpretation]
I thought it was a very clever movie. As usual it was quite disturbing since it is from the Coen Bros, but hey, it was really impressive at the same time.