Tools for the job. You wouldn't (well you might ) try and QS a whole room of enemies. The 40mm grenade is just the easiest and best way to clear rooms or campers. The best player isn't the one who can do flying spinning fagtastic QS shots from across teh map. The best player is the one who can adapt their play style to the ever changing environment and pick a class/weapon that best fits the scenario and then have the skills to use all the different equipment well.