Hey Byrna,
You blew it all up with your last statement, when you said that a A320 was an upgrade from the A300/A310 series.
As said before, many international airlines use this type without problems. Of course, every type of aircraft has its own flaws that with time are detected and, hopefully, corrected. With the rudder of the A300/A310 there is no problem at all, if you don't go over the limit, as it came on the investigation from the American A300.
However, composite materials are now coming of age and that could be one issue to consider. Anyway, this issue is not a private cottage of the A300/A310.
Check Six Krueger...