The best they have been is fair.after all who really needs em so far, all the rpg games released for the GBA have been excellent or better.
But that won't happen until a port is started in Japan and they don't need any gba ports with their wonderswans. Translating is another barrier. I doubt they will go that far when they could more easily port everything we already have. This is not a next gen. console so usually as little effort is put into the games as possible.if they ever want to show off ff2 and ff3 stateside, they will have to port it to gba anyway.