With quickscoping it is impressive that you are outgunning people who have every advantage on you except many the one shot capability and a few other advantages in certain scenario's like if the sniper is head glitching. Also i don't believe its an ego. Statistically with a combination of my game play style, I'm a great COD player.
There is nothing impressive about out gunning players with a ONE shot kill weapon in Core Game Modes - NOTHING...
There's a reason HC players don't complain about QS'ers - it's because HC is TRULY an even playing field. Snipers/shotguns and their one shot kill capabilities have zero advantage over other weapons in HC...