Basically, I don't get the point. In Hell+, defense is a necessity to survive. Even if we go dual wield instead of sword and board, we can get the nice 15% dodge bonus. The bonus to a 2H weapon is spirit regeneration I believe. So no block, -15% dodge, and for some reason I imagine the spirit generation even with that bonus isn't going to be up to par with that of DW.
Is there any point to Monks using 2H weapons at all? It just doesn't seem remotely balanced or fitting to the class.