There's no depth, surprises, or wit to the screenplay, which seems motivated by the sole desire to generate the vilest, most disgusting people and images imaginable.
Can a movie be an adrenalin-fueled, blood-gushing thrill ride and still be as boring as dirt? Apparently. The French answer to "Hostel" and "Saw" -- Frontier(s) is a 100-minute hemorrhage that doesn't bring anything to the operating table of torture-porn but more gore, cruelty and misery.
As a satire of France's recent turn to the right, Frontier(s) is both hysterical and muddled; as straight-up splatter -- a Grand Guignol concerto of scalding steam, slashed tendons and table saw, with a solo for exploding head -- it's as relentless as it is hateful, hammily directed and derivative of the dreariest slop in contemporary American horror cinema.