COD from 2007-2012 was class:
Modern Warfare
World at War
Modern Warfare 2
Black Ops
Modern Warfare 3
Black Ops 2
Haven’t really liked the other COD games since then too much
This was during its peak for competitive gaming. Since they've dumbed the game down and added so many unnecessary features. In a weird way making the maps as detailed as they are now ruined it, too many spots for people to camp/hide/flank which led to less 1v1 gun battles and more getting shot in the back.