It's interesting seeing a thread on this film after I've digested it and had awhile to think about it. First, a few caveats- I am a faithful Coen Brothers fan and also a great fan of ominous, dark, and vague films in general (It should really be a genre unto its own).
Films like this are undoubtedly going to be polarizing. Some viewers enjoy a film with a predictable story arc and a tight, conclusive ending. I see nothing wrong with this and I think it makes good sense. However, I tend more towards a film that leaves me pondering and questioning it long after it's over. In fact, I may likely derive more enjoyment from a film in this stage of contemplation long after I've seen it.
This film provide a great deal of contemplations. Considering various interpretations for the ending has brought me to consider a few points. 1) The use of a quick and efficient, perhaps arbitrary, tool of slaughter by the antagonist. 2)The fact that Anton was himself characterized as completely devoid of emotion, suggesting that all of life's events are stops along a preset course. 3) Anton's continual use of a coin to determine someones fate. 4) Woody Harrelson's (forget the character's name) insistence to Llewellyn that reason and emotion had no place in combating or escaping Anton. In consideration of the ending, with these things in mind, I don't see how a conclusive and balanced ending would be reasoned. I think the ending, and the film in general, stuck cleanly to the idea that no matter how hard you may want, or will, things to makes sense in life, that's just not how the world works. Even in looking at Woody Harrelson's character- How predictable is it that you would cast a major star like that, introduce him, and then just kill him off shortly after? Even Anton's character is shown susceptible to the arbitrary nature of things when the car he is driving collides with another, for no clear rhyme or reason.
I'm curious if anyone has any other interpretations of the general theme of this film? I think it is absolutely fantastic and even now contemplating it still am enjoying it a year or more after I've last seen it.