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People hate
XY because there's no exploration, minimal postgame (the least since Ruby/Sapphire) and very few challenging battles.
ORAS because they were faithful remakes of RS (which were worse than people remember), rather than an improvement like HGSS was.
SM because there is even less exploration than in XY, fewer Pokemon, no national dex, a horrendous online system, lots of long cutscenes.
USUM because they're finally old enough to realise 3rd versions were always a scam: the story makes less sense than SM, the 100 extra "new" Pokemon still means Alola has less than Kalos, the new battle facility is tied to the aforementioned horrendous online system, the two minigames are boring af
