I think Arena Net Should Allow More Character Variables to be Altered in Custom Arenas. It would allow for infinite field testing without costing ArenaNet anything except for the amount to set this up.
People then Could have duels against other classes, and tweak things till it feels about right. Instead of Anet employees theory crafting class balance, which is what, less than 50 people total and even less per class? We could instead have thousands of testers and experimenters. All that data, and the suggestions of a sort of MLG type panel could help us in creating the most balanced game.
I guarantee some players will be able to achieve better balance across the board.