cod 1 was fine, like cs just in world war setting but with some alternative mechanics.
the rest were optimized for consoles and marketed towards daddy gamers (casual players) and are reprehensibly skilless churned out crap that turn a profit. see cod uo, cod2, cod3,cod4,cod5,cod6,cod7,cod12,cod66,cs source, cs go. essentially any multiplayer fps game released in the past few years.