The problem is that you don't seem to realize the difference between a modification and a repair. If your car's rubber bits were so shot that the engine and tranny were falling out of the car, then of course it'll drive like crap. But the poly mount doesn't have any advantage over a rubber one in those areas.
That's like saying that your new Stazi kit brakes are just incredible because your old brakes were so worn that you were rubbing the backing plate on the vanes of the rotor.
