coming from WoW I miss the feature of turning my toon around with the right mouse button, while using the left one for turning camera (this works in GW2).
Playing a Guardian and using the Sword, I sometimes need to turn to the left or right to follow my target when using skill 3 and I really dont intend using A and D for turning around my toon.
Edit For clarification: This is while standing still! When moving there is no problem!