supergee points to Jo Walton's list of
science fiction books for adults. Seems like a good one to explore.
Boldface: I've read it.
Underlined: I recommend it.
Ada Palmer Too Like the Lightning (2016) and sequels: I've read the first one and will read the next. Recommended with various complicated reservations, enough to keep me from flat-out recommending it.
C.J. Cherryh Cyteen (1987)
Samuel R. Delany Stars In My Pocket Like Grains of Sand (1986): The only Delany novel I don't care for much, but I have long suspected this is my problem, not the book's, so I should re-read it in the foreseeable future.
Ursula K. Le Guin The Dispossessed (1974)
Gene Wolfe The Shadow of the Torturer (1980) and sequels
Robert Charles Wilson Spin (2006)
Karl Schroeder Lady of Mazes (2003)
John Brunner Stand on Zanzibar (1968)
Greg Egan Permutation City (1994)
Octavia Butler Xenogenesis (1987): I would recommend other Butler novels over these; I feel that these are less labors of love and more intellectual pursuits than some of her other books. But there is no Butler that I wouldn't recommend.
Kim Stanley Robinson Icehenge (1984): Again, there are many Robinson novels I prefer to Icehenge, but there's only one Robinson novel I wouldn't recommend, and that's Galileo's Dreams.
Andreas Eschbach The Carpet Makers
Vernor Vinge A Fire Upon the Deep (1993)
Candas Jane Dorsey Black Wine (1997): I corrected the spelling of Dorsey's last name here.
Raphael Carter The Fortunate Fall (1999)
Ken MacLeod The Star Fraction (1995) and sequels: I read The Sky Road some years ago and liked it, but have never made my way back to MacLeod, which is just a case of "so many books, so little time."
I have a very high opinion of Jo's tastes, so I need to get to some of the rest of these, most of which are on my "someday" list anyway.