Knights of asok says hello (they cost 9 to maintain - lol), by far the worst in the game. Not even that useful because the tech to unlock them is so deep in the tech tree.
Yea, it sucks, because they could be useful free troops. If they worked like Ogres and had no upkeep, you could really get a use out of them, probably not a game changer or anything even then, but useful. But at 9 gold a turn, they are crippling to an economy.
