when you think so about real time combat and rpgs then there are many rpgs that are no rpgs for example diablo 2 and i belive that there are "some" people who say that this is a rpg. (me included)
You are right... lots of people know Diablo as an RPG... and I do admit that it IS an RPG its just a different type. There are more than one RPG as you've probably noticed throughout all your gameplays.