Cod got big because of cod 4. It stays big because its the go to game for everyone. 95% of games that come out no one knows about. Everyone knows CoD, everyone gets CoD. --- To this day.... we still dont know...... WHO LET THE DOGS OUT?!?
CoD 4 went at 60 FPS and to this day has some of the best graphics in video games.
It doesn't have the best graphics at all, but it is very easy on the eyes because of the 60 FPS. They could make the game look a lot better if it was in 30 FPS but sacrifices must be made to have 60. --- Nothings right with you if nothings wrong with you.