I liked the movie. It's been a long time since I read the book but I thought it was quite faithful. I remember getting an overwhelming sense of hope from the end of the book but I didn't get that from the movie. Just as bleak and sparse as the story but not as hard to get into. All in all, I thought it was pretty good.
It took me ages to get into it. It was really painful. But then it kind of clicked and I got it, got the rhythm and his style and in the end really enjoyed it. It was the first and only McCarthy book I have read (so far) so I have no idea if all his books read the same or not. I don't think I could go cover to cover on another book written the same way.. but we'll see I guess.
Edit: seriously could have done without the shot of Viggo Mortensen balls... but that's just me.