I managed to get Call of Duty: Infinite Warfare, and the CoD4 Remaster on sale a week or so ago, so I have just been playing the latter.
And I finished it feeling a bit "bleh" about it, I guess. Sure, it has its standout moments. I really enjoyed the USMC portion of the campaign, and All Ghillied Up is a suitably iconic mission, but the rest of the campaign is just running around the woods/farms/farms in the woods, and it gets a bit samey, quick.
I would also say that the weapon sandbox is also a bit disappointing. Sure, there is only so much you can do with a modern/"realistic" shooter, but spawning the player with a rifle with a silencer/scope/grenade launcher every mission doesn't exactly make me want to explore many other options, other than picking up the occasional sniper or shotgun.
Its aged fine - but it doesn't exactly standout anymore, especially compared to the more bombastic campaigns of the later CoDs, and its imitators.
EDIT: Oh, on a sidenote, the PC port is terrible. To get past the instant crash, I had to reboot Windows in safe mode, then launch the game and set it to Windowed mode, then I had to restart my PC again, and finally get into the game. Bizarre.