Have you ever thought of adding a world boss to Faction Assaults? I think i would be a fun idea. He could have his own little area and mechanics (mainly focusing on adds). Like some adds that did crazy healing and some that did big A.O.E damage some that focused on Healers. And He could throw plague bombs down making a dot on the ground.
I personally would love to have a hard world boss in the game for once. One that takes longer then 30 seconds to kill and can’t just zerg.