I can't get into COD campaigns at all anymore. There's just no freedom or substance to them to really hook me.
Nothing but "shoot this endless wave of mindless enemies then I'll open a door for you and we'll do it again, also no exploring or MISSION FAILED" It's disappointing too how IW had the chance to really build upon BO2's steps in the right direction but instead they took the same old same old half assed approach.
Just want to throw this out there, but how many people buy CoD for the campaign? I know there are some, especially those that like to follow the story, but the majority? Heck, I know there are some that just want Zombies/Extinction and would pay for that alone.
I've personally always bought the games for the online experience and keep the campaign either as a distraction for when I want to shoot something but want a break from online, or if there are connection issues, etc. I always end up working on it until I have it 100%, though. Stupid OCD...