The problem with HA's is that all classes that lack a ranged weapon are not able at all to kill the HA. However, all other classes are able to kill eachother, its only a matter of skill. With the HA its not. If you lack a ranged weapon, you can never kill the HA. Never. It is impossible. Completely impossible.
Did everyone understand that now? If one team has 10 people without ranged weapons, and the other one is just one HA, the HA will win if he has enugh arrows. And that brings us to the weakness of the HA. HA's can be taken down by archers, other HA's and the lack of arrows. Most HA's use strongbow and 3 quivers of arrows. If the strongbow and khergit bow was increased in slot to 2, it would make the HA's a lot easier to kill, since then one only has to dodge 2 quivers of arrows before you can kill him/her. (still a LOT of dodging just to be able to kill someone though) and then the HA can still keep dumping you with his horse untill you die, I've seen it, they are truly that dishonourable)