I actually don't agree with any nerfs on this. There is a simple strategy to overcoming horse archers, just put your own archers in front of your infantry or even cavalry and they will mow them down, especially their horses as they seldom have horse armor. In case they pull big flanking maneuvers, just turn the line to face them. If they charge their cavalry towards your archers, just charge your infantry or your own cavalry at them. The horse archers usually get destroyed and even against the khergits I had no issues. A bit surprised to find this thread to be honest as I thought the horse archers are kind of easy to counter.