If you have played Call of duty then you know what I mean by they have messed with the recipe.
Every year they think that they need to add something new, to go to the extreme and make a call of duty that was better than the last. When they do this, they dilute the game, make it more complex, and to easy. When I mean by say to easy is that in older cod games you would have to rank up and play the game more and to get the item you want and then do certain challenges with it to get attachment for set item. Example, in Ghost if you want a item, all you have to do is buy the Weapon/item with points.
One last point, they say is that COD has to be relatable, Call of duty is about war, not about some guy hacking drones, or space weaponry getting stolen, or PMC's.