Well, yeah, in the beginning all characters are stereotypes. They have to be because you have to have a recognizeable starting point for your viewers/readers. It was only after the input of other writers/actors other than Roddenberry that a full-fleshed character evolved.
Almost every time, people see things in your work that you never saw or even intended. Often times that translation is for the better. So it was for Worf. He started as kind of an animalistic character and evolved into a cool, strategic warrior who used his tremendous combat skills only when necessary. Much credit to Dorn for the coolness.