The trick, when you are a thrower, is to approach without showing that you have a throwing weapon (sheathed or anything). So, the archer think he has time to shoot at you and no flee.When you are close enough and/or when he turn his back, you shoot him.
Like I say, archers are not a problem.
HA or cav lancer often die when they charge at me (ok, I die in 10% of cases), or at least their horse.
The problem is not cavalry or archers, the problem is 50% of player are 2h/pole, slow, without protection or any teamplay.
I often see a 2h's running faster than me as I'm trying to protect them with my shield.