If you think Sword/Shield are bad, you are not going to enjoy X and Y
Unless you put on rose-colored glasses, of course.
Pokemon games were always weak in terms of story (anime fixed that) and graphics. Gameplay kept getting better with each title and reached the highest current point with Sword/Shield, same goes for graphics. X and Y are literally SNES games with a slight bit of modern coating: repetitive object placement, bland environments, lack of character model variety, etc. And the pokemon don't even compare to Sword and Shield or even Let's Go.
If you want to actually enjoy a Pokemon game, play Ultra Sun and Sword/Shield. Let's Go is okay but is very dated, X/Y is very dated, Omega Ruby is okayish.
Won't be surprised if the whole hate towards Sword/Shield was orchestrated by Temtem marketing team. Seeing how Twitter is built on the idea of drama and hating something, trying to cancel it, no wonder if companies start to fund the hate hashtags to get attention. Sword/Shield advanced the Pokemon games like no other game in the series did, there's now an actually enjoyable story and characters that are slightly better than "anime cutouts". If you want to go hating Sw/Sh, Temtem with its boring monsters, shameful plagiarism and non-existent fanbase (of Sw/Sh haters) is always there.