Here's an idea:

Make the ADS time 1 sec.  Do not allow anything to change this.  No attachments/proficiencies/perks should affect ADS time for sniper rifles.

Then, remove aim assist for snipers.  The object of a sniper is to be a good shot on your own.  (I also dislike aim assist in general because I think YOU should be a good shot not the game, but this is a topic for another thread.)

If you can still quickscope after these changes, then by all means do so.  But I honestly think that 90% of the quickscoping community will be unable to adapt.

knife lunge is essential for riot shields and tac. knife users so no

well believe it or not there is knife lunge in mw3, bear with it

riot shield ftw

blast shield and throwing knife

umadbro?

Sniping is what worries me the most about MW3.  If it is full of mini-grizz wannabes running around trying to get quickscope montages I am going to be sad that I bought the Hardened edition.