Forget the talk of the film being slow, this isn't an action film or an old school shoot 'em up western, anyone looking for that should search elsewhere. Whilst there some great action scenes, where hostiles excels is in setting the tone for an early American world where law and order rest of gun power.
The cinematography is exceptional, meanwhile Christian Bale is superb playing a army captain who is seemingly tough and unflinching but shows an undertone of melancholy, Rosamunde Pike pulls of a great performance as a woman thrust into the ugly world of war and anarchy by a brutal attack on her family home, a scene is exceptional and unapologetically shocking.
Overall the film is about the futility of trying to civilise a wild land built on violence, and about the tragedy and the sheer pointlessness of conflict against fellow man.