as i said before, difficulty isn't an argument because:
if you play long enough you can be good with everything
and, a difficult class is most of the time a good one
so i think every HA used this argument already but i've played it too and it isn't. if you have a courser or arab, you can avoid or outrun every one on the battlefield, and if you have 4 HA or even 3, you can shoot eveyone after you play for a day, especially horses, because they are 3 times as big then a normal person, and if you watch your back, you can run past some one 10 times untill he's dead, it's not a difficult class, maybe to begin with but not to play with.
And so you are looking to punish the average players simply because of a few, dedicated, good ones?
That's not true at all. A courser seems to have lower acceleration than most other horses for some reason. So unless you are riding at full speed it's very difficult with the lower manoeuvre to keep away from a team of lancers on all but the most open maps. Especially if they can turn quickly using an arab.
As for arabs, HA on those get shot down quickly/lanced down quickly because they have such low hp. Unless you have an heirloomed one, they really aren't that good.
If you have the time to run by someone 10 times till they are dead, then they deserve to die because it likely means they have separated themselves from their team and gone rambo. If you didn't do it, someone else would, maybe a lancer. Fact is with the low damage, you have to run by them at least 10 times before they are dead. Unless you are expert at bump shooting like some HA. Though I mostly try and avoid that method.
Simply put, you just don't like the fact that HA stop you getting kills. Lancers would have a much freer time of it if HA weren't around. And to be honest, there aren't actually that many of us compared to every other class in the game. So I really don't see this as a problem.
As other people have stated, HA aren't OP. We are annoying. And you are just annoyed by it. When you get killed by an HA over and over and see lots of HA in every map getting high K/Ds. Then come back and complain. Otherwise you're just moaning about your horse getting shot. In which case us being annoying has worked