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Gen 6 was the most meh and boring partly because GF butchered XY as a glorifying tech demo. It deserved better especially the lack of a third version or any depth like end game and its only gimmick, mega evolutions, being a one time thing to be replaced with z-moves. It almost got to shine with ORAS until Masuda intervened its development and with Gen 7 as the killing blow for any further chance of improving.
Unpopular opinion but I feel attached to Gen 6 because it's the 'abused stepchild' of Pokemon that deserved a better treatment.