The Expanse's ship combat is very cool. A worthy successor to the re-imagined Battlestar Galactica (minus the mumbo jumbo that marred the end of that series!).
I like the characters too. I haven't read the books, and I understand this character was changed a lot, but I really like what they did with Klaes Ashford in the series. Way to subvert expectations! The TV show more than once appears to set up a cliché (this is the bad guy, he has delusions of power and is going to undermine this other character) only to subvert it. More of that, please!