They get to spam Quick Shot which hits for 1.5k - 2k. That's an average of more than 10 times what a player's quick shot hits for. Where did they get those bows and arrows... or, if it's because they're just such awesome archers, why are they wasting their skills protecting keeps? Why not have us lowly players protect keeps and have those 10k HP Mages, Guards, and Archers go attack enemy keeps?
The only substitute for victory is overkill.