Watchable, but... (spoilers)
The writing is rediculous.
- I found two people bound in the back of the truck. Guess I'll just quietly save one of them and leave without telling anyone.
- A maniac just rammed my car. Guess I'll go have a cup of coffee and not tell anyone about it. Somehow the characters can't explain to the police what happened.
There are many more examples like this throughout the movie. Great scenery, well shot and unique story... but the writing was atrocious.
Overall it's watchable, but fatally flawed.