I’d say that it’s fairly clear that the writers had an endpoint for the season, a few key narrative, Kaiju and character milestones that they mapped out, as well as some narrative pipe that they wanted to lay down towards the third season.
The season mostly succeeds from that perspective but there’s validity in some of the criticisms.
One thing to keep in mind is that the show is serving different international audiences, including a core of American fans who only want to see big Kaiju fight.
My sense is that they got the balance a bit different for the second season such that those who liked the first season may not be as happy with the second and vice versa.
In particular, this season seems to be the natural conclusion to many unresolved issues from the movie Kong: Skull Island — one of the most divisive movies in the Monsterverse. So, if that movie is one that someone liked or found intriguing, they are likely to find this season particularly satisfying.