For normal planes or boring holes in the sky, no.
WHat I did find is that my ability to be accurate and improve my skill was limited by the servos I used. It would still allow me to fly, and it would still let me enjoy the hobby. What I found is that your linking can be only as tight as your weakest link. If everything is stiff and the servo is not repeatable, then you will not get the repeatability that you may desire. If everything is loose and all you want to do is fly, then the 3003's are good enough.