I think it's the best COD multiplayer since MW 2019, and I've played each yearly release since COD4 (skipping the Black Ops series--for some reason Treyarch's games don't appeal to me as much). I have something like 7 real-time days played in MW2 2022 Multiplayer. And a good chunk of that was only playing Shipment 24/7 to level up guns faster.
Not sure why people say the maps are boring. The only map I truly despise is Taraq, which I believe is a COD 2 remake, which explains it. Camping snipers love it, though.
Of course, if I didn't have a dedicated group of friends to play with, I would have dropped MW2 a while ago, so I think that's key. For me, it's a feedback loop of: level up guns in MW2 to use the meta in Warzone to support my squad.
But, I will say, I love the game mode variations MW2 MP has. Particularly Gunfight: you and one other teammate face off against 2 other players on tiny maps. First to 6 wins wins. They'll also have a limited-time 3-player version that comes and goes. This mode gets me so hyped--hyped in a way that Warzone Ranked Play does. I think it's because success/failure lies solely on me and my buddies--no randos. Also Ground War is a blast--like putting a scaled-down Battlefield game into COD.
Edit: And like others have said, the campaign was great.