If you dare to watch this film be sure not to expect much of a story, rather enjoy the surprising beauty of the Argentinian Pampa and the time the film gives you to look. I guess almost every shot lasts longer than 10 seconds and many run far longer and create a dreamlike atmosphere. At some point it reminded me of a still picture gallery. Not much talking is done either and the dialog is creating more fog then clearance. There is only a very thin storyline but most things remain incomprehensible.
Films like Gerry" come to mind, or The Shooting", "The Draughtsman's Contract" or even Shutter Island". The best approach might be to absorb the images which are often really stunning and don't try to solve the riddle. It seems to be meant as an experience, not as a thesis on what went wrong in this or that person's life. The main character gets deeper and deeper into the desert while everything gets more surreal.
Although all this sounds rather weird and boring, the film has an inner suspense that doesn't let go. Viggo Mortensen plays a man who looses his dignity in the course of the events but he never appears ridiculous which is much to the credit of the actor.