Say what you will about the Call of Duty series, but you know at least one person who loves at least one of the games in the series -- whether it be the "classic" WW2 era Call of Duty games (Call of Duty Classic, 2, 3, and World at War), the Modern Warfare series, or the Black Ops series.
With Call of Duty 4 being remastered, why not let people try the other games of the sub-series they like and let pessimists replay the OG games they love so much?
On another note, why isn't Black Ops 2 backwards compatible yet? Black Ops 1 is and Black Ops 2 is the most requested game for backwards compatibility. So it only makes sense.