OT, but it reminds me of the release of The Last of Us II. (Game, not a book, just to clarify). Massive amounts of people - likely some 4Chan/Reddit incels started rating the game as 1 (on a scale of 1-5) well before its release. (Someone at Naughty Dog - the production house - leaked an important plot twist before anyone had even had a chance to try the game and... a shitstorm ensued.)

Funnily enough, this prequel concentrates solely on female characters and their very heart-wrenching, desperate lives and storylines. The game itself WILL break your heart and is exceptionally well made. Critics' score is 93% while the audience score is still very low at 2.9. Oh and, did I mention that one of the female actors received death and rape threats upon the release? Because of course. Point being, people just wanted to have what they expected and were never even willing to give the game a try (or alternatively, gave up when it became emotionally taxing, which it is most of the time. Or maybe because there are zero important male characters in the game. Wild guesses but alas.)

Same goes with JKR's book, it seems. Before anyone has even read the goddamn synopsis they're willing to make a bonfire of the books. Maddening idiocy.