The real way to quickscope... is to dragscope! Just do it quick and fast. No one shoots the millisecond their scope pops up, it's too difficult - dragscoping's waaaay more accurate.
scoping in and draggin the crosshair to where the other player is. with aim assist your crosshair will slow down around the enemy is, that is when you shoot. if done properly you will hit 9/10 shots with ease.
if you still have blackops (only cod i have left) i can show you how to quickscope properly with combat training or something, if you can do it well on blackops.. you can do it brilliantly on mw3.
Haha, absolutely! Black Ops actually made me a better aggressive sniper because the way sniping worked practically demanded you to dragscope - once you learnt that, sniping on any other CoD suddenly became so easy