If Xbox fans could add any one game to the Xbox One backwards compatibility list, it would be Call of Duty: Black Ops 2. Treyarch's 2012 shooter has officially outpaced Red Dead Redemption as the most-requested Xbox 360 game on Microsoft's official backwards compatibility survey page, with more than 77,000 votes at the time of this writing.
Rockstar's open-world Western game is trailing close behind with a little over 75,000 votes. Interestingly, Call of Duty: Modern Warfare 2 is back at fourth place behind Skyrim, despite that hugely popular petition calling for Activision to remake it for current-gen consoles. Granted, there is a big difference between remaking a game for a new system and just getting the old version to work on a new system - Activision says it may remake older Call of Duty games, if it can ever find the time and talent to do it well.
