This review contains MINOR SPOILERS for the DVD release of “Babylon A.D.”"Babylon A.D.” is something of a guilty pleasure; a complete no-brainer that teeters on the edge of pointlessness, yet when the action starts it is hard to tear yourself away.Although it’s not quite the Hindenburg of disasters, Vin Diesel’s monosyllabic opening spiel fails to pack any kind of punch and instead comes with a touch of foreshadowing on what to expect through the rest of the movie: “life’s a bitch and then you die.”As the titles role and Diesel goes for a stroll (aided by some impressive camera pans over a broken world), the intended grittiness is very quickly lost by the accompanying rap music. Think “Dark Angel” without the coolness factor, the opening act proves to be a bitter disappointment as …