CoD 4 was great to play and one of the best. MW2 I still loved and had a heap of people to play with as well. Black Ops 1 was still good, because they brought back zombies and I found that better than multiplayer for any CoD game, especially with the variety of weapons and powerups etc to help you go into further rounds. That and BOPS I stayed up for the midnight release and played online with my cousin (my best friend).
Anything else after it just plain failed. So I don't play shooters most times now.
That is where I drew the line also. The thing is they keep on making the same game over and over again. That is how they capture young generations and keep on making the same game.