This is probably the best review I've seen for No Country for Old Men. It's very insightful, covers many points and Coen films, and long. Here's a sample of what to expect.
"What you got ain't nothing new," a retired lawman says in No Country for Old Men, counseling a colleague who's so traumatized by a recent mass murder case that he's thinking of quitting his job.
That's hard truth, and the fact that the sheriff, Ed Tom Bell (Tommy Lee Jones), is more introspective than some of his colleagues doesn't make it go down any easier. Bell's astonishment at the violence unleashed by his quarry, Anton Chigurh (Javier Bardem) -- an assassin tailing a Vietnam vet (Josh Brolin) who filched a briefcase full of drug money -- is so deep that it spurs Bell to reconsider his life, his job, the nature of morality, the mind of God, the shifting cultural character of the border country he calls home, and the profound ways in which the United States changed between World War II and the Reagan era. Bell is one of many characters forced by Chigurh's rampage to consider his place in the universe: who he really is; what he stands for; whether he believes what he believes and behaves as he does by choice, predisposition or predestination; whether evil exists and whether God, if there is one, cares one way or the other.