The show has some polarizing aspect to it, about half of my friends are really into it (me included). Half my friends bounced off the first couple episodes.
You have to get through those first few episodes before it becomes more clear what the show is about. And even then, you might be misled into thinking it's about a merry band of crew floating around space on a ship; because that's not what it's about. The clue is in the name; it's about humans expanding beyond Earth, and the conflict that arises from that.
https://www.geekwire.com/2018/expanse-safe-jeff-bezos-says-a...
The show starts off quite slow, which is probably its biggest "weakness".