Slowmoe says he can see the warp when he rotates the rotors by hand.
Is the rotor is mounted flush with the bearing hub flange? Is there any discoloration (bluing) on the wear surface? Bearing axial play set correctly? If all this checks out, I agree that he got a bad rotor.
Manufacturing rotors isn't rocket science. They're made of cast gray iron. But a few things can go wrong... too hard, too soft, hardness may be variable within the rotor, poor control of graphite flake size, casting porosity, or poor machining as manufactured.
95 E320 Cabriolet, 131K