The A320 series are designed to fly a 1g trajectory for pax comfort. In part this is done by the use of a 'soft' elevator which operates far more slowly than it should. (Notice next time you do your flight control checks how slowly the elevator moves relative to the stick movement).
This is why overspeeds in the descent are fairly easy to achieve (maximums of .78/320kt generally will prevent this), however I can't help feeling the 'soft' elevator was a contributary factor in Bilbao.
TEMPO is absolutely right when he suggests that a directly proportional response to stick movement would be better. Direct Law anyone?
Edited to give proper credit to TEMPO whose username I had screwed up!
[This message has been edited by airforcenone (edited 30 May 2001).]