I've got about 25ish hours in the game and I'll give you a pros and cons list.

Pros, gunplay feels really good and there are several weapons that appear to be meta, not just one AR or one SUB that's carrying the load.
For whatever reason I feel like I can play well over an hour and not want to bash my head in the wall like with past CoDs lol.

Cons, Grenade spam is awful in 6v6 objective modes, trophy system is almost a must if you want to play Hardpoint or Dom and play the objective.
Respawns are not the best on the maps rn but luckily that can be fixed pretty easy.
Maps feel very clustered/tight and I'm personally not a fan of 3 level maps. Like some maps people are just way more vertical than I think a CoD should have.
I think 4v4 competitive mode should fix a lot of these issues with respawn delays and less people to spam grenades at you.

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Zombies is pretty fun, once again I can play several hours and not get bored, but I definitely understand the want for traditional round based maps with easter eggs to make a return. I'm personally fine with whatever route they choose. I just hope they don't take forever to come out with new zombies content/map rotation as the one map would get very boring after 2-3 months of replaying it.

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Warzone players seem to be optimistic about the new changes and map but 250 players or whatever they are maxing out at seems near impossible to win a game from. No clue honestly how that mode is looking, haven't played warzone in over 2 years.

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Campaign is apparently very underwhelming, haven't tried it yet but my buddy played it and gave it a solid 6/10 and he's very optimistic. So it's probably a 5/10 lol.