Ultravox and the song Vienna springs to mind...........It means nothing to Me......Oh Vienna ?
It's a shame. I bet you didn't play the separate zombie campaign, also playable in online and local co op? Eleven chapters, the first one took me forty five minutes.
Or the twin stick shooter Dead Ops Arcade II? You even have power ups that flip the level into full first person zombies mode.
You don't have to touch the MP of the standard zombie mode if you don't want to. I agree with you that it is overly convoluted nowadays, and only enjoy it because I am a gun for hire. Matty467 does all the leg work in upgrading the weapons. I just protect him from the horde while he does it, win win.
But this really is an awful lot of game for the money if you don't get embroiled in the fashionable slagging off that it gets every year. I just don't play the MP so it doesn't effect me, simples.