2 facts remain .....
The A300 has been in production now for 32 years (and still is), and has not got a record of any spurious failures leading to tragedy.
There have been a handful of A-300 accidents, practically all CFIT, or pilot error.
Let the record stand.
It doesn't make it immune to any failings (as any airliner) , but there are a good many high cycle examples out there which stand testament to its solid design.
A type rating would surely give you the required knowledge of the A-300's rudder properties which should of course be taken into account whilst flying the plane.