They are a very fickle plane to use. There are afew routes they work splended on, but for the most part, they suck.
The A300 was origionaly built to ferry large amounts of passengers between large hubs cost efficiantly. In this game theres no need to worry about that since high density routes are already packed with 500 airlines trying for a piece of the pie.
Another reason these birds where so popular IRL, is that they have cavernous cargo capacity. But of course, cargo isnt a factor in this game yet.
With massive competition, constant feul prices, an invariable number of potential passengers. theres no real need for it.
They are the fastest way to turn a mutualy profitable route, into a very competative slash fest where where nobody earns anything worthwhile.
If you must have a widebody, be my guest, If you decide to drop it on one of my hubs, ive got a fleet of these waiting to compete with you. Im not afraid of useing 2x frequences either. For me a route is effectivly dead once an A300 is on it, so im not afraid to write it off as a loss.
Screwing with people is about all they are good for. I totaly dont recommend this plane.