, here are my sci-fi and fantasy reviews, arranged in order of favouritism. I achieved this order by starting at the most recent and going backwards, inserting into wherever they fit. Books of course cannot be linearly ranked in this fashion; in particular literary quality and fun ideas are hard to inter-rank. Books get points for: quality and fun of reading; novelty; interest of the ideas; worldbuilding; being a classic; "must include something by this author"; and more. Note that points-for-ideas does not imply that I agree with them, merely that there are some; you get more points if I agree, of course. But sadly most SciFi authors tend to pick up crap philosophy (hello Plato, I'm looking at you).
This list only includes stuff I've actually written reviews for, which is most of the recent stuff but very sporadic earlier. Stuff I would add: The Deep (Crowley); more Banks; Blish; more LeGuin; Wolfe; Benford; The Forever War; etc.
The top, but unrankable: The Hobbit, Lord of the Rings,
* Beasts and Engine Summer, John Crowley
* Foundation, Isaac Asimov
* Icehenge, Kim Stanley Robinson
* White Queen, Gwyneth Jones
* Neuromancer, William Gibson
* Anathem, Neal Stephenson
* The Iron Dream, Norman Spinrad
* Across Realtime, Vernor Vinge
* Starship Troopers, Robert Heinlein
* Divine Endurance, Gwyneth Jones
* Dune, Frank Herbert
* City of the Chasch / Servants of the Wankh / Dirdir / Pnume, Jack Vance
* Ancillary Justice, Ann Leckie
* Stations of the Tide / Vacuum Flowers, Michael Swanwick
* Consider Phlebas, Iain M Banks
* Rendezvous with Rama, Arthur C Clarke
(those above this marker are "you should read")
* Emphyrio, Jack Vance
* The Raven Tower, Ann Leckie (PROMOTE?)
* The Dragon Masters, Jack Vance
* Ancillary Sword, Ann Leckie
* Grass, Sherri S Tepper
* Uprooted, Naomi Novik
* City of Illusions, Ursula LeGuin
* Look to Windward, Iain M Banks
* The Enemy Stars, Poul Anderson
* The Caves of Steel and The Naked Sun and The Robots of Dawn, Isaac Asimov
* Out of the Silent Planet / Perelandra / That Hideous Strength, C S Lewis
* Heroes and Best Served Cold, Joe Abercrombie
* Big Planet, Jack Vance
* Atlas Shrugged, Ayn Rand
* The Diamond Age, Neal Stephenson
* The Martian, Andy Weir
* The White Mountains, John Christopher
* The Cadwal Trilogy: Araminta station; Ecce and Old Earth; Throy, Jack Vance
* The Languages of Pao, Jack Vance
* The Silver Chair and The Voyage of the Dawn Treader, C S Lewis
* Spinning Silver, Naomi Novik
(those above this marker are "worth reading")
* The Long Tomorrow, Leigh Brackett
* Blindsight, Peter Watts [2023/01]
* Wyrms, Orson Scott Card
* Ender's game, Orson Scott Card
* Confluence: Child of the River / Ancients of Days / Shrine of Stars, Paul McAuley
* Blood Music, Greg Bear [2023/01]
* Space, Time and Nathaniel, Brian Aldiss
* The Undercover Aliens, A E Van Vogt
* Neptune's Brood, Charles Stross
* The Lions of Al-Rassan, Guy Gavriel Kay
* Rosewater, Tade Thompson
* Star King, Jack Vance
* Project Hail Mary, Andy Weir
* Fifth Planet, Fred and Geoffrey Hoyle
* Sabriel / Lirael / Abhorsen, Garth Nix
* Shikasta, Doris Lessing
* H G Wells anthology; The War of the Worlds
* Redshirts, John Scalzi.
* Sundiver, David Brin
* Blue Remembered Earth, Alastair Reynolds
* Rotherweird and Wyntertide, Andrew Caldecott
* The Ten Thousand Doors of January, Alix E. Harrow
* The Owl Service, Alan Garner
* Utopia, Thomas More
* Glory Road, Robert Heinlein [2023/04]
(those below this marker are "meh")
* Anthem, Ayn Rand
* Feersum Endjinn, Iain M Banks
* The Gift / The Riddle, Alison Croggon
* Daughter of smoke and bone, Laini Taylor
* Toyman, E C Tubb
* The Green Odyssey, P J Farmer
* Transition, Iain Banks
* The Brightness Reef trilogy, David Brin
* Artemis, Andy Weir
* Nemesis, Isaac Asimov
* The Narrow Land, Jack Vance
* Something Coming Through, Paul McAuley
* Ringworld, Larry Niven
* The Eye of the World, Robert Jordan
* I, Robot
(those below this marker are "you should not read")
* Raising the Stones, Sherri S Tepper
* Wherever Seeds May Fall, by Peter Cawdron
* Three Body Problem, Cixin Liu
* Ancient Light, Mary Gentle
* Proxima, Stephen Baxter
* Bones of the Earth, Michael Swannick
* The Exiles Trilogy, Ben Bova
* Heart of the Comet, David Brin and Gregory Benford
* On the steel breeze, Poseidon's Wake, Alastair Reynolds
* Seveneves, Neal Stephenson
See also
* Science Fiction: The 101 Best Novels 1985-2010