I’d say it was at least an 8/10, if not a 9/10 or 10/10. I would highly very recommend this book series to anyone who’s a fan of science fiction, especially if they have watched the TV adaptation of The Expanse, because if you enjoyed the TV adaptation, you’ll likely also enjoy the books
I really also enjoyed the series as well, and the TV series was a rare case when the show sticks pretty close to the source material too. I was sad when it got cancelled.