Maybe I should also write here something. Like many people said, HA got tremendously nerfed due to rage polls and rage threads, not because of some flaw in the game mechanics. It was of course very natural that such forum requests ended for the favor of HA haters, as this game is mainly played by 2H / pole players. And what a surprise, these classes are of course the natural prey of skilled HA's as they lack protection like a shield in the middle of the field. However, there are many good ways to kill HA's: you can be a light lancer, you can be a skilled archer/thrower, you can be a skilled pole guy or you can be another HA.
I have been playing as a horse archer for about maybe 1 year. My main character is level 34, with 18/24 stats, 6PD, 4 HA, 172 WPF, 8 Riding, 3 PS. Although the heavy and unbalanced repairs, such as you still need to repair your arrows as if your wpf is for nothing, plus the horse repair ( this is a part of the deal of being a cavalry ), I was still enjoying playing as my prey was my natural prey and my predator was my natural predator.
After the nerfs, I fell deep on the levels of the food chain because of my heavily reduced accuracy, reduced drawing speed and recalculated aiming trajectories. This is such a big frustration for a player with horse archers, and even more for whose level is 34, which translates into a considerable amount of time investment.
I hope that one day the HA gets buffed again back to its natural position and I, and many of my fellow cavalry player friends get back to the game.