Except that DF groups are first/second try clearing this at a very impressive rate, and you don't really need to speak the same language as the people your playing with since NPCs are guiding the flow of battle and giving everyone instructions.
I'm curious - How would you nerf this? Taking away mechanics isn't a nerf, its a new trial. They could lower the bosses health, but you'd still need to hit him with 1-2 dragon killers, making such a nerf pointless, since you still have to work together.