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I liked it, but it ran its course.
Didn't like how some pokemon were still underwhelming even with a mega, but that's probably more on the strongest megas power creeping everything, including the weaker megas, to oblivion, as well as taking up the one mega slot per team.
Also, adding Fairy/Dragon and Tough Claws/Sand Force/Magic Bounce/-ate to everything was already getting old by ORAS.