I just saw this. Jesus, what a downer. The movie completely nails the sense of utter despair.
I had read the book and loved it. Or rather, I completely admired the craftsmanship of the story but still wanted to off myself.
This movie shows that the book is filmable after all. They did it right. All of the uneasiness I had about it getting the Hollywood treatment is thankfully unfounded. I had some quibbles about the ending, but nothing serious.
The casting was perfect I would say. Viggo Mortensen pretty much matches my mental picture of "the Man" and clearly conveys a sense of exhaustion and grim determination.
I will be seeing this again, just not for a while.