>>718491974
I can't say anything about multiplayer past Ghosts, but the quality of campaigns has definitely gone down. I can't imagine the people who wrote earlier CoDs sticking around after the mess some of the later games became, and the fact the campaign was outright gutted from bo4 surely didn't help either. Nu-mw1 was surprisingly solid after years of shit, but it should have been its own thing instead of a reboot. 90% of characters and events were different anyway, and the ones that were in the originals (so just Price and Gaz) had different looks, voices, and personalities. Cold War was also alright, definitely better than the shitshow that was bo3, but not as good as bo1 or bo2, or even waw (also, for me it's the first cod since mw2 which had memorable music). Nu-mw2 was when they dropped the ball, and from there the plot of the campaigns feels like a fever dream. I wouldn't be surprised if you told me bo6 was written by chat gpt.
As for the zombies, I know the main producer guy left during or after bo4, so there's that. He still let some jarring shit fly during bo3 and bo4, so I'm not sure if it the mode wouldn't be as bad now if he didn't leave.