Well maybe I suck at dueling, but the GA Zons that I have seen have really kicked ass. Plus, they're kind of the underdogs. Everyone plays Pallys, Barbs, and Sorcs - I usually try to make at least 'somewhat' unique characters.

My other dueler is a Dragon Talon Assassin (a build which everone also says sucks, but I have had really good luck with her - even beaten a charger pally).

FYI, I mostly duel by Clan Honor rules. No teleporting, duped items, overpowered curses, effects, items, etc. (Maybe you're familiar with them - I'm not sure.)