IMO the best line in the movie ((spoilers))
Ivan Locke: Well hear this, Gareth. When I left the site just over two hours ago, I had a job, a wife, a home. And now I have none of those things. I have none of those things left. I just have myself and the car that I'm in. And I'm just driving and that's it.
Just sums it up so well. Damn shame not everyone could enjoy this film the way it was intended to be.