I refuse to even play MWII, MWIII and Vanguard out of principle. Their storytelling is over dramatic bile. Multiplayer is spastic in movement and tone.
Black Ops 6 will likely have those same issues, but I hope that Treyarch can pull through with their campaign.
Vanguard, MWII and especially MWIII are THE EXACT SAME GAME, you played either MW4/2019 or Cold War and you already played those. Single player is also nothing special to write about in those games, in fact if this is how bad BO4's campaign was going to be I am glad they axed it.
I seriously doubt Treyarch will pull anything thru. The Black Ops nostalgia has worn thin, I want to see them try something else, but you know even if they wanted to Activision would not allow them to spread their wings. They tried, oh boy did they try, with BO3 and BO4 but somehow, they are always forced to make the same game over and over by the end.
Plus, it's not the same group of people that made WaW, BO1, BO2 or even BO3, many of these devs are completely different people with completely different ideologies. Poor Vanderhaar was brought back for Cold War and guess what, he spend months in his Dodge Ram Powerwagon out in the desert instead of fixing the disaster the game was on launch day, even these old devs don't have the touch anymore.
I wouldn't use the excuse that "Cold War was good, though!" either since it WASN'T Treyarch's game: Most of the work was done by Sledgehammer and Raven. Only towards the end did the SJW California snowflakes over at Sledgehammer have some sort of internal problems with Raven to the point of stalling development, and were forced to cool down and work on Vanguard while Treyarch cleaned up their mess. Most of the work was done by that point, all Treyarch did was make the Zombies mode and "put their own spin" on what was already completed.
BO6(so Cold War is BO5 now?) is going to be all Treyarch, no building blocks to work off of, and remember they already wasted precious development time they had for the game on the universally hated, dead on arrival Vanguard Zombies mode. Their last "proper" game was Black Ops 4 and we know how that went, altho with how awful the franchise is now even that game looks good in comparison. With how deep in shit the franchise is now, I don't see even them pulling a miracle out of their ass, no matter how "good" the game might be. MW2019 was supposed to do that, and how long did that last?
Speaking of Multiplayer, leaks have shown that there is barely anything new from MWII/III in the game, it will be the exact same thing but reskinned(just like Cold War). That game will really ride-or-die on it's Campaign/Zombies this year, especially with XDefiant out right now. Frankly, I don't care about "Black Ops but in 90s" angle or a re-make of BO2, whatever it is they have planned. It's all played out by this point, I don't care about Mason or Woods or anybody else. Introduce new characters and make it your own game at that point, remember when we had spin offs like that? Ghosts, Advanced Warfare, Infinite Warfare, even if not all of them hit all the right notes, at least it was SOMETHING different.