Yea I have seen the same theory of a possible % miss regardless of acc. I only play tank on twin so I can only speak as a tank. As far as melee dps the monk... well he never misses and floats around 478 right now. I never miss but, I am @ the highest theoretical cap atm. When I switch over to warrior from pld my warrior only had 472 and he never missed as well.

Either way some people are recording misses @ 500+ and that's where the theory of a possible miss %. Either way there is no solid numbers. As it currently stands we try to gear for 475 or so.