Wolfe – one of the best literary stylists in SF. His books in the 80s were breathtakingly good. The Book of the New Sun is four volumes, consisting of The Shadow of the Torturer, The Claw of the Concilator, The Sword of the Lichtor and The Citadel of the Autarch (alt title: The Castle of the Otter ). There are also a couple of other New Sun books, all set in a far future time and filled with wonders. Other fine Wolfe Books are Soldier of the Mist (which uses the same plot device as was later used in “Memento”), Free Live Free (even the NY Times considered this one of the best books of the year) and There are Doors, as well as his great short story collection The Island of Doctor Death and Other Stories and Other Stories.
Shiras is pretty much only known for Children of the Atom a sympathetic look at mutant supermen.
John Crowley is a fantasist.
Finally, Benford is a first-class hard SF writer.
As for Cordwainer Smith – including his name on the list makes up for all other mistakes.
As far as the Terry Brooks – Ray Feist has pointed out that Shannara showed the publishing industry that non-Tolkien fantasy (yes, I know ) can sell, which opened things for many fantasy writers.