I haven’t been reading adult science fiction long enough to have finished any series yet (I’m just starting way too many instead^^), so this list of series is YA only. All series are in my opinion very good from start to finish, no second-book syndrome, no anti-climatic conclusion.
Chaos Walking by Patrick Ness
Favorite of ever because it hurts so much.
Insignia by S.J. Kincaid
Highly underrated series that has the most precious characters and awesome scifi aspects. Also a favorite!
Red Rising by Pierce Brown
After reading many dystopian novels Red Rising came along and made them all look boring in comparison with its setting and kickass plot.
The Lunar Chronicles by Marissa Meyer
This series features the most precious characters and I’m quite embarrassed that I still haven’t read Stars Above yet (at least that way I still have something to look forward to and it’s not REALLY over yet)
Gone by Michael Grant
This series is dark, very messed up and brutal at times (still not over Panda) and a roller coaster of a read. Definitely have this one on my to-reread list for next year.
BZRK by Michael Grant
Another series that’s highly underrated. I know you don’t see many people talk about the Gone series either but it came out quite a while ago and I know it has a massive fan base. BZRK not so much though. And if you think Gone is messed up at times, you’re in for a ride with BZRK.
Across the Universe by Beth Revis
Across the Universe was the first book set in space that I read and I always wonder if I would love it just as much now as I did then.
The Reckoners by Brandon Sanderson
Certainly not Sanderson’s best work but I loved the idea of this series and it’s pretty entertaining. Can’t wait for the follow-up series.
Escape From Furnace by Alexander Gordon Smith
This series is horror and when I say it’s dark, I mean DARK. With every new book it gets more messed up and by the end of the series it was just one epic mindfuck.
Partials by Dan Wells
I love stories where the world is not going to end because of some threat from outside (like alien invasion) but because of people’s own stupidity, something they invented/experimented with which then backfired.
Variant by Robison Wells
You don’t really now how scifi-y this is until you get behind the secret of this boarding school. And then you’re in for a ride!
Legend by Marie Lu
What I liked most about Legend is that this is one of those very rare cases where you actually get a view of the whole world and don’t just see the system in the country the book is set in.