Teeth I know you there are horse archers in EU 1 who are very good and are mostly on the top of the score board.
In my opinion this means, that it is possible that you succeed as horse archer and I think it should be possible to score nice no matter what class you play if you are a good player. Mostly, the top scorers are melees, not horse archers, but nobody becomes exasperated with it.
Personally, for me both 2h and polearm are easy valour mode and I'm bored of it because it is too easy so i play non mainstream classes for quite a long time.
That doesn't mean I want to get them nerfed, not at all, but I think classes are quite balanced at the moment and I definitely don't think horse archery needs a nerf.