I have seen movement in film ( On dvds )where there is no motion blur. Watching it frame by frame. I understand what you mean about using it all the time but maybe if you can tell the difference between motion blur and non motion blur then you are overdoing the effect. For something like someone walking there is only a small amount of motion blur. Motion blur shouldn`t make everything move about like the flash. It can be used quite subtlely and i am sure it can be overused. I was only giving SVicious a guide and not hard and fast rules.