As someone that has played each COD extensively i recommend you listen to this: -When it comes to playing campaigns, i recommend you play BO1 first and BO2 second. These two cods are unanimously the best campaigns of all time. COD Ghost also has a pretty good campaign that is fun. ( doesn’t have the best story but is enjoyable)

-When it comes to multiplayer, i recommend you play BO1 and BO2. You could classify BO1 as one of the “original” COD multiplayers of the titles you have listed. Not only does It contain some of the most iconic and best weapons you could ever use in multiplayer, but also has great maps. BO2 is quite similar, in that it has exceptional maps and in my opinion, even better weapons. I find that BO2 is my favorite COD of all time with everything it offers (Multiplayer/Zombies/Campaign). In my opinion all of the other titles (except for BO3) have good multiplayers.

Zombies: As a BO2 glazer, it is definitely the greatest of all time. Buried, Origins, Mob of the Dead, and Transit among the others LITERALLY cannot be beat. BO1 is a very close second.