I'd say Battle Hardened actually. I don't agree with the C4 nerf but I was hoping to christ that Battle Hardened would be buffed somehow, but no. I still go into matches now where I get blinded, i go to check my class and see that I have BATTLE HARDENED selected. Meanwhile I'm trying to get to cover to let the effects of the stun/flash grenade finish. And it happens more often than how it was in BO2 where you would occasionally get a stun/flash effect but it wasn't as terrible as it is here in MW. Mid-Season update NEEDS to have a BATTLE HARDENED buff so I can AT LEAST be able to see the PERK in my tier 3 slot WORK like it's SUPPOSED TO.