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JRPG fans tend to like SM because of the human cast and the unique setting. But that's basically it. Nothing else about the game really had staying power. Z-Moves, Festival Plaza, Rotom Navi, and all the tutorialized gameplay was widely panned. USUM was considered good by people who were hungry for a "Challenge Mode", but also panned for ULTRA CHANGES like the corridor city where Necrozma lives.
It really is just a solid single player story kind of game, assuming you care enough about it to power through the handholding. XY and SwSh were more built around community play.