As a healer I don't really care how much or how little is pulled at a time, I totally understand if a tank is not comfortable with doing massive pulls. As a dps I would prefer bigger pulls but I never intentionally pull anything on my own because I think it's rude and it's literally the tank's job to do the pulling. If I see impatient dps players intentionally pulling mobs on their own over and over again, I just let them die. If you want to tank so bad, play an actual tank or die.