Dune
The best-selling science fiction novel of all time. Herbert built a complete ecology, religion, and politics for a desert world, then embedded within it a savage critique of messianic leadership. No subsequent SF novel has matched its world-building density.
The opening is a wall, “extremely hard to understand at the beginning”: Bene Gesserit, kwisatz haderach, mentat, all dropped with little hand-holding, and many readers nearly quit before it clicks. The dialogue is stiff and formal, one reader protesting “his dialogue is prim and scientific, no one would actually speak,” which flattens characters into mouthpieces. Others echo that “Princess Irulan’s epigraphs spoil the plot,” previewing where events land. The women hold real power but it runs almost entirely through influence over men and reproduction. And a subset simply find long stretches boring, self-serious to the edge of parody, whatever its standing in the genre.
The case for it and the rest of the canon open with Pro.
