I really enjoyed S1 and S2.
It really depends on why you watch the Monsterverse.
If you enjoy the human side of it, the lore and backstory, then S1 is definitely more your cup of tea. More human, less monster.
If you like watching kaiju run around and mess stuff up, then S2 is more your thing. More monster, less human.
As I said at the beginning, I enjoyed both seasons. There are things I liked and didn't like about both seasons.
I think they've set up some interesting things for Season 3. I'm looking forward to it.