Call of Duty: Black Ops has over 100,000. Call of Duty: Modern Warfare 3, a game from 2011, has nearly 70,000 active players on Xbox.
Activision fixed these games earlier this week and now, players are returning to them in mass. Almost every Call of Duty on Xbox 360 was made backward compatible for Xbox One and subsequently Xbox Series X, but after a short while, the multiplayer for these games became basically unplayable as the servers didn't function properly. However, a lot of peoples' favorite entries have been virtually unplayable for a while.
Despite the fact that it's a series that has a pretty familiar formula, Activision has done a good job of making sure there's enough variety. Some prefer the World War II games, some prefer the modern era games, some prefer the futuristic games. A ton of different types of games in the series have made their mark, with different groups of players having their preferences on their favorite eras of Call of Duty. Every holiday season for the last 20 years, a new Call of Duty has been released. The Call of Duty series is one of the most tried and true online franchises in gaming. A bunch of old Call of Duty games are having a resurgence on Xbox right now.
