We've gone through this over and over again.
Quick scoping is and has always been part of online shooters. There was never a need to nerf it in any other shooter until Modern Warfare 2. The reasons why it quick scoping is considered cheap in Modern Warfare 2 is the interplay between the auto-aim and sleight of hand. People have and always will be using sniper rifles as their main weapon in online games and even though you think it's cheap, unfair, has to be nerfed, people will find ways to play (good) with sniper rifles.
Treyarch themselves did nothing to nerf quick-scoping, they completely broke sniper rifles alltogether in the worst way possible. They did not put any thought into getting rid of loads of quickscopers, they just decided to make the bullet not go straight. This is nothing that only affects the evil quickscopers you don't like, it's something that completely breaks the sniping in this game alltogether. Why even put a sniper class in the game if you want to break it anyways?
If quickscoping were as cheap as some people say it is, you could just use that class as well and get hundreds of kills in every round. I mean; if it's just an easy way to get kills, you should definitely do it, no? What I'm saying is that even though the aim-assist and the perks in Modern Warfare 2 allowed you to quickscope really, really fast (too fast, imo) there's still skill involved. If you're trying to say there isn't, you should just try it for yourself. If you're one of the guys who say quickscopers only spin around all the time to then die you're completely ignoring the fact that being useless for your team has nothing to do with the weapon they're using but the way the play the game. People can be useless using an AK74-U as well. The fact that you go into a game seeing how snipers run around on a small maps drags your attention on them. You basically want to see them to stupid stuff so when it happens you just say I knew it, these bastards.
Treyarch could have done something to make quickscoping harder, they could have disabled the aim assist completely when using a sniper rifle and could have disabled the cross-hairs, for example. Treyarch, instead, just did something for the sake of nerfing quickscoping. They've never taken a look at what quickscoping is about, have not reached out to the sniping community to talk to them about it. No matter what they were trying to do, they completely failed. The randomness is bullshit and even if you don't like quickscopers you should get why it's bad to tackle the problem this way - why randomness in an online game is bad.