Greg Costikyan reviewed Lord Valentine's Castle in Ares Magazine #4 and commented that "despite the detail, despite the novel's dreamy pace, Silverberg never loses his reader, is never boring. To the contrary, Lord Valentine's Castle is, in the demeaning argot of Madison Avenue, a page-turner."[1]
Kirkus Reviews states "In terms of sf underpinnings, Majipoor is an inexcusably flimsy construct; and a large cast of promising characters is left rattling around the lengthy and plodding narrative in such a meagerly developed state as to resembled blighted peas in a pod. Disappointing."[3]
Douglas Cohen for Tor.com said that "The story isn’t a puzzle, challenging readers to figure out whether this tale is science fiction or fantasy. It is science fantasy. It is a successful melding of both genres, as it borrows, tweaks, merges, and in some cases entirely reinvents. Books like Lord Valentine’s Castle seek to take the best of both genres and merge them into a seamless tale. Containing scientific and fantastical elements is both acceptable and expected."[4]
