Campaign was great, Zombies is good, Warzone is meh (I've never been a fan to begin with, preferred Blackout in Black Ops 4, and am an Apex Legends player). I'm sure what you wanted to hear about was Multiplayer, however, and I can say that it's definitely one of the better iterations in the past several years. As a CoD veteran starting on CoD2 I would say it's nowhere near my favorite CoD, but it's a good enough game to bite into and give a try to form your own opinion. If I had to shorten my opinions:
Pros:
- Gunplay is great
- Movement is great (besides climbing/vaulting, extremely sluggish and breaks the gameplay)
- Audio is fantastic
- Camo-grind is fairly simple
Cons:
- The SBMM/EOMM is extremely violent in this game. You will never really feel as if you're improving. If you play with friends/family of a lower or higher skill level to you, whoever isn't the better one isn't going to have a good time.
- The maps are the worst of the lot of any CoD to have launched
- Killstreaks are damn near useless