First pick that I have to second: Tale of the Malazan's, Book of the Fallen, by Steven Erikson. Excellent gritty dark high fantasy series. Think Game of Thrones with gods.
For sci-fi I have to second Ian M Banks, Peter F Hamilton and Dan Simmons, but absolutely have to add Alastair Reynolds, which should be right up your alley, and since you asked for a series: Revelation Space.
Cyberpunk you've probably read William Gibson and Neal Stephenson, not much more to add there, though above mentioned Revelation Space series has some similarities, while also being a space opera.
Jim Butcher is also seconded, but I'll add Monster Hunter International by Larry Correia, which is a pulpy b-movie inspired modern day dark fantasy horror action comedy mix, with sprinkles of gun porn. The first one might just be my favorite book ever.
C. S. Friedman's Coldfire Trilogy is like a mix of sci-fi, fantasy and horror, so that should suit you very well. Colony on alien planet where nightmares come to life.
Gene Wolfe's Book of the New Sun is another dark sci-fi fantasy mix, far future where human civilization has regressed to medieval, the sun is close to burning out, and we've got alien visitors, with sci-fi blaster weapons. The protagonist is a torturer's apprentice.
I'll also have to second Robbin Hobb but personally I think Soldier Son is her best series, followed by Liveship Traders. Basically inverse order of when she wrote them.
I also cannot recommend Peter Watts highly enough, very good sci-fi psychological thrillers. Wether it's a bunch of psychos on the bottom of the sea, or the crew of a spaceship with cyborgs and vampires. (Starfish and Blindsight, respectively).
I could keep going for quite a while.