The first modern warfare was my guilty pleasure mainstream game. I normally don't get into those kinds of FPS', preferring to stick to a more TF2 kind of game. But, on a whim, I borrowed CODMW from a friend and played through the campaign and was actually very pleasantly surprised by the story, especially the ending how everything more or less got swept under the rug. It produced one of those "my god... what if..." moments in me.
Sadly the second modern warfare didn't do it for me, and the black ops campaign just became another bland story about super badass "amurica"