I just finished the campaign, that's all that needs to be said really, imo it's no more or less than any other cod campaign in its basically run through it once and then forget it exists. However tho a pain at first I actually didn't mind the open world stuff, I never bother with DMZ, that said the more I got towards the end I realised it's easier to just murder everyone.
However for anyone willing to run it there is a cut scene after the first credits, although it probably plays if you skip them maybe someone can confirm?