This is stale and frustrating to watch for so many reasons. The story is simple to a fault, and the characters are painfully moronic and incredulous. The only redeeming quality is that Jonás Cuarón's cinematography is clearly influenced by his father's early work.
Not the most complex of storylines - a nutter taking the law into his own hands protecting the US Border against Mexican migrants - but still a solid (topical) offering from a director with few films to his name. Jeffrey Dean Morgan is strong as a psycho racist (aided by an equally psychotic dog), and Cuarón shows some real directorial talent (especially in bringing a sense of the beauty and harshness of the desert)
The premise is extremely simple, and more emotional development during the downtime would have substantially enhanced the film. Still, I think it's a well-directed thriller. The chase sequences are relentlessly enthralling, the cinematography is unexpectedly outstanding, and the music and sound design are pretty damn effective. It might not give you the depth you want, but it's still an enjoyable piece of suspense.