So, my current favorite scifi adventure series is The Expanse. Four books are out so far: Leviathan Wakes, Caliban's War, Abbaddon's Gate, and Cibola Burn. Fifth book is on its way out soon. In addition, there's a tv show in the works (who knows how good or bad that'll be). Currently on Caliban's War. Series premise is a cold war between the United Nations of Earth (with the largest space fleet in the solar system), the Mars Congressional Republic (smaller population and military but a bit more advanced) and the outer planets and colonies, oppressed by both and somewhat run by a proto-state terrorist organization. Starts off as a murder mystery and takes some levels in "well, that escalated quickly." There's no FTL or any of that stuff here yet, at least. Main characters are fairly down-to-earth (lol). I'm not sure any side or characters can be described as 'good,' but there are some definite ***holes. YMMV, though.