When you think of Call of Duty, do you ever really think "replay value?" The campaigns are usually a "one and done" deal, and most players likely begin to move onto other games once they've hit Prestige mode in the multiplayer suite. You get your 20-or-so hours in and then never touch them again, right? That said, Black Ops 3 served up easily the strongest value for money of any CoD game to date, as in addition to all the above and the usual Zombies mode, there's a special mode called Nightmares, which is unlocked after the original campaign is completed, remixing it with a zombie invasion premise. It's actually a lot more entertaining than the regular campaign (which is, to be kind, a mess) and gives a greater incentive to keep coming back than any previous title in the franchise.