I don't recall many incidences where the SS bus has not responded appropriately to sick movement, one that comes to mind is the cross wired stick, that reversed roll. F/O took command and landed safely.
As for AF447, the PF almost continuously applied nose up, when he applied nose down the A/C responded.
After all this discussion, I still cannot figure out why the pilots managed to stall this aircraft, it seems it was a simple case of loss of airspeed?