In years past I've assembled top tens or even twenties of the best books/graphic novels/comics I read over the preceding twelve months, but I didn't do that last year and I shan't be doing it this year either. Instead, I'll simply note in passing that out of everything I read in 2017, probably the best things were Paul Auster's The Music of Chance, Joe Haldeman's The Forever War (the book which this year reignited my fervour for SF), John Varley's The Ophiuchi Hotline, Alastair Reynolds' Diamond Dogs, Revelation Space and Redemption Ark, M. John Harrison's Light, and Stephen Baxter and Alastair Reynolds' The Medusa Chronicles. Four of those I wrote about in 2017 (follow their relevant links in the list); the other two, Light and The Medusa Chronicles, both extraordinary books in their own ways, I might get round to writing about at some point. Happy New Year!
Novels, Graphic Novels, Comics
A Gun for Sale by Graham Greene (Heinemann, 1936/1960)
War of Kings Omnibus by Dan Abnett, Andy Lanning, Paul Pelletier et al (Marvel, 2016)
King-Cat Comix #76 by John Porcelain (King-Cat, 2016)
The Music of Chance by Paul Auster (Faber, 1991)
Paul Auster's City of Glass by Paul Karasik and David Mazzucchelli (Avon, 1994) (reread)
Elseworld's Finest: Supergirl & Batgirl by Barbara Kesel and Matt Haley (DC, 1998) (reread)
Justice Vols 1–3 by Jim Krueger, Doug Braithwaite and Alex Ross (DC, 2006) (reread)
"Churchill's Men", "St. Ethelberga and the Angel of Death" and "The Terrorists" by Michael Gilbert
Various David Mazzucchelli short stories in various anthologies
Ghoulash by Sam Hiti (LaLuz, 2006)
Ghoulash 2 by Sam Hiti (LaLuz, 2009)
Thanos: The Infinity Revelation by Jim Starlin (Marvel, 2014)
Thanos Vs. Hulk by Jim Starlin (Marvel, 2014)
The Mother's Mouth by Dash Shaw (Alternative, 2006) (reread... I think)
Batman: Year One Deluxe Edition by Frank Miller and David Mazzucchelli (DC, 2005) (reread)
The Infinity Entity by Jim Starlin and Alan Davis (Marvel, 2016)
Thanos: The Infinity Finale by Jim Starlin and Ron Lim (Marvel, 2016)
Our Mother by Luke Howard (Retrofit, 2016)
The Thanos Quest by Jim Starlin and Ron Lim (Marvel, 1990) (reread)
Diary Comics by Dustin Harbin (Koyama, 2015)
Melody by Sylvie Rancourt (Drawn & Quarterly, 2015)
The Forever War by Joe Haldeman (Weidenfeld & Nicolson, 1975)
Kramers Ergot 9 by various (Fantagraphics, 2016)
JLA: Rock of Ages by Grant Morrison and Howard Porter (DC, 1998) (reread)
The Belfry by Gabriel Hardman (Image, 2017)
Light by M. John Harrison (Gollancz, 2002)
Slow Bullets by Alastair Reynolds (Gollancz, 2017)
The Voyeurs by Gabrielle Bell (Uncivilized, 2012)
(Most of) Galactic North by Alastair Reynolds (Gollancz, 2006)
The Medusa Chronicles by Stephen Baxter and Alastair Reynolds (Gollancz, 2016)
Revenger by Alastair Reynolds (Gollancz, 2016)
The Centauri Device (novella) by M. John Harrison (F&SF, January 1974)
Diamond Dogs, Turquoise Days by Alastair Reynolds (Gollancz, 2003)
Mindbridge by Joe Haldeman (Futura/Orbit, 1977)
Revelation Space by Alastair Reynolds (Gollancz, 2000)
The Ophiuchi Hotline by John Varley (Sidgwick & Jackson, 1978)
Vague Tales by Eric Haven (Fantagraphics, 2017)
Nova by Samuel R. Delany (Sphere, 1971)
In the Ocean of the Night by Gregory Benford (Sidgwick & Jackson, 1978)
The Kurdles by Robert Goodin (Fantagraphics, 2015)
400 Billion Stars by Paul J. McAuley (Gollancz, 1988)
The Infinity Gauntlet by Jim Starlin, George Perez and Ron Lim (Marvel, 1991) (reread)
The Night of the Trolls, in Bolo by Keith Laumer (Millington, 1977)
3001: The Final Odyssey by Arthur C. Clarke (Voyager, 1997) (possibly a reread; I can't actually recall if I've read it before)
Chasm City by Alastair Reynolds (Gollancz, 2001)
Night Passage by Alastair Reynolds, plus other stories in Infinite Stars (Titan, 2017)
Crickets #6 by Sammy Harkham (Fantagraphics, 2017)
Redemption Ark by Alastair Reynolds (Gollancz, 2002)
Various P. M. Hubbard short stories (F&SF, 1953–1969)
The Gritterman by Orlando Weeks (Particular, 2017)
Tarantula by Alexis Ziritt and Fabian Rangel Jr. (AdHouse, 2017)
In the Hall of the Martian Kings by John Varley (Sidgwick & Jackson, 1978)
The World of Ptavvs by Larry Niven (Orbit, 1978)
Started but Nowhere Near Finished
A Legacy of Spies by John le Carre (Viking, 2017)
Started in 2016 but Still Nowhere Near Bloody Finished
Found in the Street by Patricia Highsmith (Heinemann, 1986)
Periodical Comics
East of West by Jonathan Hickman and Nick Dragotta (Image)
The Black Monday Murders by Jonathan Hickman and Tomm Coker (Image)
The Dying and the Dead by Jonathan Hickman and Ryan Bodenheim (Image)
Kill or Be Killed by Ed Brubaker and Sean Phillips (Image)
Secret Empire by Nick Spencer and various (Marvel)
All New Guardians of the Galaxy by Gerry Duggan and Aaron Kuder (Marvel)
Lazarus/Lazarus X+66 by Greg Rucka, Michael Lark and various (Image)
The Old Guard by Greg Rucka and Leandro Fernandez (Image)
The Visitor: How and Why He Stayed by Mike Mignola and Paul Grist (Dark Horse)
The Walking Dead by Robert Kirkman and Charlie Adlard (Image)
Paper Girls by Brian K. Vaughan and Cliff Chiang (Image)
Saga by Brian K. Vaughan and Fiona Staples (Image)
Stray Bullets by David Lapham (Image)
Injection by Warren Ellis and Declan Shalvey (Image)
The Wild Storm by Warren Ellis and Jon Davis-Hunt (DC)
Curse Words by Charles Soule and Ryan Browne (Image)
Mage: The Hero Denied by Matt Wagner (Image)
Maestros by Steve Skroce (Image)
Aliens: Dead Orbit by James Stokoe (Dark Horse)
Punisher: The Platoon by Garth Ennis and Goran Parlov (Marvel)
Dark Nights: Metal by Scott Snyder and various (DC)