To me this didn't have too bad an ending.I was left with the impression that the assassin was badly injured but actually got away which rarely happens in movies...It does suck though when a movie ends and we are left to guess or imagine how the characters end up so maybe I'm just being biased because I enjoyed No country for old men so much.
oh yea, movie was great, bad guy was a scary dude. and it's been a while since i've seen it but i remember feeling a bit disappointed
it was awesome.