I think a class advocate would be a good idea, a community chosen representative or two that works with the developers and relays information to the class community. It has worked well in other games I have played, I see no reason such a concept would not work here.
I also think a public test server would be fantastic, a place where the new changes being made to the game could be assessed by the public before it goes live to the public. There will still be complaints and the final decision is still Anet’s, however I think some implements like these would go along way with making people feel better about future changes.