Riverworld, Ringworld, Dune, and now The Entire

Greg L Johnson, at SF Site, on Kay Kenyon's City without End (The Entire and the Rose, Book 3):

"...a series that wowed at the beginning for the complexity and creativity of its invented setting, earning comparisons to classics like Riverworld and Ringworld, has now filled that setting with characters whose motives and aspirations are often hidden and always conflicting, a situation that makes The Entire and the Rose at least as comparable to Dune and the tension-filled novels of C.J. Cherryh as it is those other works. Which means that at the end of City Without End, even though several story lines have been concluded, a couple in surprising and dramatic fashion, the crux of the problem still remains. Titus Quinn's family and loved ones are scattered across two different universes, and whether he can save or hold on to any of it remains in serious doubt. The stage is now set for the final volume in what is already looking like one of the classic science fiction series of our time."

Got that? "One of the classic science fiction series of our time." We keep hearing that about Kay's series.