Having grown up "devouring" the writings of the likes of ERB, Asimov, Blish, Heinlein, and Norton, it probably been at least 10 years since I bought a SF book. And that may have some of the Star Wars spin-offs about Han and Leia's 3 kids.
There's good sci-fi out there from this century. Off the top of my head "Gun Runner" by Larry and John D Brown is good.
I despise his politics but Scalzi's "Old Man's War" series was pretty good, at least through "Zoe's Tale" which is as far as I got.
The "Legacy of the Aldanata" series buy Ringo is great, especially the first four.
"The Aeronaut's Windlass" and "The Olympian Affair" by Jim Butcher are solid, with a promise of more to come.
"The Eden Chronicles" by S.M Anderson are good fun, and play to our politics.
"Into the Real" and "Through the Storm" are building a really interesting world.
David Weber's Safehold series is epic.
And since this is a Hugo thread and the Hugo's include Fantasy I would be remiss not to mention the "Saga of the Forgotten Warrior " really well written epic Fantasy.