Here's a good fix for lopsided world PvP that worked in Wintergrasp:
If you attack an enemy while he is alone but you are in a group, you get "dishonorable" debuff: your stats are reduced as a function of by how many people you outnumber the enemy. If you attack a solo person with a 2 man group, your stats are reduced by 50%. If you attack a solo player with a 3 man group, your stats are reduced by 67%.
If the Alliance insists on turning every fight into a one-sided gankfest, at least give us a chance to fight back.