Well done to the pilots for putting this plane down safely.
Although I'm not a pilot or engineer, I would think losing the rudder completely should actually be less of a problem than having it stuck in "full left" or "full right" , provided the rest of the fin is big enough to provide longitudinal stability. Still looks like Airbus should have another carefull look at the tail of the A300/310 series, as this seems to be the weak spot on this aircraft