EMP grenades obliterate sentries and gardians. Throw just one anywhere by them and they're toasted.
As for the Stuns, good luck with that. Maybe they could make them more noticable? I also think they are OP. Why run anything else when you can have a grenade that if it doesn't hit, it will wait until somebody does come in the area, or better yet, go pick it back up.
Flack jacket: Working as intended. If you can damage them at all they will die from a grenade. Otherise a direct stick from sticky or a hit from a frag and then the explosion will kill them. If it can't stop grenades, then whats the point of the perk?
My problem with the smg's is how accurate the hip firing is, Hipfiring should not be more accurate than ADS, and it seems now it is..with or without laser sights,
no problem with shock charges, if you run into one, just back up out of it...
cant comment on Flak Jacket
guardian...hmmm no real problems wit it
my BIG problem is the lack of time to react to being shot, and how the red screen and vibration seems to be a second behind.
Many times I am dead as soon as I see someone with no time to react at all..
also these 'search preferences' seem backwards to me, when I select 'best connection' I lag the worse, if I select 'any' it plays better
Re: shock charges. They don't bother me a whole lot, and if memory serves Tac Mask reduces their effrcts on you. Either way, the devs actually set out to make the tactical grenades more effective (per tweet from Von), and they succeeded. Besides which, you use shocks at the price of having to leave behind several other very good tacticals.
Re: Guardian/Sentry. All of the scorestreaks have been heavily buffed. I rarely run into guardians (and I've only played dom so far), but for the most part they're easy to avoid or destroy if necessary (as someone pointed out, EMP grenade does it easily, regular grenades do a good amount of damage, or you can just equip a black hat). As far as the knifing goes, I believe a knife attack no longer does any damage at all to turrets. I personally use the Sentry Gun & absolutely love it...unlike BO1 it does major work this time around, and if placed properly it can hold down a flag all by its self. But mine tend to get killed fairly quickly, so I don't think it really needs nerfing just yet. Don't think I've seen anyone else using it in my lobbies yet.
Re: Flak Jacket. Don't know. I just now unlocked it so I haven't used it myself, and I don't recall being upset at any explosive kills that I "should" have gotten but didn't in-game. If anything I see it far less often than I did in BO1.
Re: SMGs. They need to increase the recoil, at least on the ones with higher rates of fire, and they probably will. That would make them a little less accurate at close range, but still give them the advantage over ARs there. But at distance that would swing things firmly into the ARs' favor. That said, I haven't really had any bad experiences with long-distance gunfights vs. SMGs because I don't generally get into long-distance gunfights.
Disclaimer: My main class is built around the MP-7 w/shotgun "secondary".