Yeah it really sucks but that's how it's been since COD4. The way I see it you shouldn't be able to knife if you're "flinching" from being shot.
Yeah, I mean it really is that simple and obvious. The knife lunge is a good thing because it makes knifing easier and more tactile when you do it. No one is really annoyed by being knifed so much as being knifed while theyre shooting someone in the throat.
There's a whole host of other balance changes I'd make as well:
Make the sniper rifles uselful again. QSing wasnt a problem, QSing people from shotgun distance was a problem. The fix is not to make sniping impossible, it would make far more sense to just really nerf the damage up close, in the same way shotguns cant do anything from afar.
LMGs in general also need serious help. As weapons on their own theyre not really superior to assault rifles, due to the slower sight in time, higher recoil, worse hip spread and super slow reload times, despite the similar size clips. The speed reduction on top of that is an insult. Its no surprise hardly anyone uses them, because theyre really not all that useful as theyre basically just bad assault rifles that make you slower in their current form.
And speaking of shotguns, the way they work is insane - 1 hit kill from 5 feet, 0 damage from 6 feet. They shouldnt just range out completely like that. I should at least be able to hurt people to some degree from nearly any distance if a pellet hits. They should suck for anything but CQB, but they shouldnt be useless.
Hardline pro needs to be nerfed immediately. The way you can reroll any package AND get a higher chance of a better killstreak is insane. Its abusive to the point that its practically an exploit. You should be able to reroll just care packages, and the chances of getting whatever should be exactly the same as the first time.
The RCXD also needs to be nerfed - its practically a guaranteed kill, often a double kill, for just a mere 2-3 kills to earn it. Not even the mortar team, napalm or rolling thunder guarantee a kill, quite often, you get nothing. Flak jacket should also protect you 100% from it...I mean, isnt that the point of flak jacket in the first place? 9 out of 10 times an rcxd kills you as if you didnt even have it on.
Scavenger needs some kind of buff. It just doesnt do enough that cant be otherwise compensated for elsewhere, and the other perks in that tier are more universally useful. It should at least refill equipment on top of what it already does.
And the difficulty of unlocking the pro perks varies way too widely. It is god damn near impossible to throw back 5 grenades for flak jacket pro, because the opportunity never arises, since EVERYONE is using the obviously superior semtex with with super short fuse. Same with ghost and the sentry, but at least thats just one. Tac mask pro is also nearly impossible...I've been working on it nonstop since the prestige, and I've just finally gotten 20 kills from someone poisoned by your nova. Now 20 flashbang and 20 concussion on top of that? Literally may take weeks, its way harder than it sounds.
I definitely think you should get some XP for playing wager mode, even if you lose. Its kind of in a ghetto right now, it just feels more rewarding to play standard MP, not to mention unless youre placing first or second in nearly every game, its still more efficient to get your points on regular MP. There's some really fun gametypes in there, but theyre not reaching their potential where they are.
And I know I'm beating this dead horse, but they need to differentiate the weapons more, just for variety and fun's sake. The aug and famas should be 20-30 damage. Play with the fire rates, sight in times, hip fire spreads, ranges, etc. Throw some sway in here or there, maybe even zoom levels. Each weapon within a class should be unique and interesting in its own right, not a very slight variation of each other. And they need to make sure there are no clear winners - now that people have unlocked more guns, you dont see too many MP5s or enfields around, and its obvious why. You hardly ever see a skorpion, mac-10, uzi, pm63, kiparis, or any shotgun, sniper rifle or LMG on the field. 80% of every team is rocking an assault rifle (almost always a galil, famas or aug). 10% have an ak74, and then there's the few outliers. People will always gravitate towards the best weapons, and if entire classes arent getting used, then there's something wrong.
Overall I still really like the game, but in its current form I cant really say its superior to MW2. IW got quite a few things wrong, but it was never this...bland. Every weapon and map was unique, and while those OMA/DC/Noob Tube people were annoying, when they arent around and youre playing barebones so youre not constantly bombarded by killstreaks, its still a superior game IMO.