Jacobean tragedy on steroids, the Devil Rides Out, Throne of Blood and some of the better spaghetti Westerns, blended to create a forum for issues that are ageless and set in a Thai environment that has the rich color and culture of that world. It gets inside your head and won't go away, brooking no trite objections.
It also reveals things to yourself about yourself; I enjoyed the creative brutality having the excuse of a moral blanket to wrap it in.