I've played very few Call of Duty games... that I have owned. I have played some at other people's houses, but I do not consider them "played" since it wasn't me just sitting down to play the single player or focusing on the multiplayer.
Casual gameplay:
- World at War Multiplayer/Zombies on Wii: terrible controls!
- I have some memory of the Estate and Wasteland maps from years ago, but I do not remember what game I played them in.
Single player completed:
- MW2 (where my memories of Estate and Wasteland cropped up) and some of the extra missions. Single player was pretty good but has the (as I understand it) classic failings of COD games. And that is that the game requires you to complete objectives in the way it is designed. It actively punishes you if you try to get creative. If you don't do it correctly, the game will kill you, either with a kill screen or with an unkillable sniper. Another reason why I just put "pretty good" was the fact that I was also playing the Battlefield 4 SP at the same time and that was amazing with great presentation.
Single player not completed:
- COD4: Didn't even get off the boat. The one thing I hate the most in any game is timed missions. And this one is right in the beginning of the game which makes it worse. You have to get off the boat before it explodes. I would die in the same spot on the catwalk every time, just inches away from where the checkpoint was. There seemed to be no way to get past it, I watched tutorials and everyone can just run across that thing and make it except for me.
Multiplayer played:
- COD4: I originally bought this game to play MP on the Vogon Ares server. I was a former admin on the Vogon Quake 3 servers when COD4 was added and wanted to try it out. For some reason I was never able to get it to connect, at the time perhaps it was because the server was in UK. I never really got it sorted. I had tried the MP on regular servers but it wasn't what I was into.
- MW2: played it for a bit. I had got this because a co-worker played and it was on sale. He only played hardcore S&D which wasn't my cup of tea. On my own in regular MP I wasn't that good. The UI is terrible.
- Black Ops 4: This one I played for almost a year and just in multiplayer. I think I ended up around Master Prestige 211, with perhaps ~60% challenge completion and 7 gold weapons. Definately my favorite multiplayer game since Quake 3 and it was due to the speed of the game. A lot of people complained that the game was too fast, but for me, the faster the better. My mouse speed was set for 36/legacy ads and the mouse was 400dpi.