I agree it wasn't as good as MW2019's campaign, but I still think it was good. Like, outside of an over reliance on gimmicky vehicle segments and that one stealth mission near the end of the campaign where you're trying to reunite with your squad (though, I have to admit, I enjoyed the Ghost/Soap interplay in that mission), I think the gameplay was a pretty solid action oriented spin on MW2019 with generally more compelling characters, an obviously sky high production value, and a story that seemed like it was going somewhere interesting until MWIII happened and killed all the build up.
Like, as a point of reference, I'd say MW2019's campaign was a lot like RE4, revolutionary, a new direction for the series, and widely considered one of the goats of the series, MWII's by comparison was RE5, not nearly as innovative, takes the new direction its predecessor was taking the series and runs with it hard to a pretty ridiculous place at times, and generally a step down overall but still rather fun to play. MWIII obviously is RE6, but we don't need to talk about that.