Something that has bothered me about many an MMO is the amount of Hotbars available to you. 1-9, Shift+1-Shift+9, F1-F9, Ctrl+1-Ctrl+9, and any other combination you could think of. Having so many hotbars takes away from actually thinking about what skill you should use. Rather than everyone having everything for every situation readily available on multitudes of hotbars. I'm not saying you should limit it down to 2 or 3 skills only. Possibly 1-9 and maybe an extra 5 on the side for items such as food and drink.