XY were just okay for me. I was expecting them to be amazing, but after the main adventure, it felt mostly empty. I really liked the Looker Bureau sidequest, but that was the only postgame part that I found interesting. The Mega Stones available for only one hour a day was a turn off from hunting them, especially since the ones I actually wanted to use are given by NPCs anyway. I'm glad ORAS changed that. And I've never cared about the Pokedex (collecting just for the sake of collecting is boring and tedious for me), so "catching them all" was never an incentive to keep playing, especially since I can't do online/multiplayer stuff so it's impossible anyway.
The League members didn't show up very often outside their post, and the only ones I really liked out of the 13 of them were Valerie and Wulfric. There's not even any bonding time with the Champion, which always happened up until these games.
Team Flare didn't really make any sense to me. I don't know why there wasn't at least someone keeping an eye on Lysandre to make sure he doesn't do anything dangerous, considering he's open about his crazy ideas. I'm not a fan of gloom and doom everything sucks characters, so I don't like him for the same reasons I didn't like Cyrus. I liked the scientists more. I thought they had neat designs and some of them were entertaining. I also wish we could've seen Xerneas/Yveltal in their natural habitat before they get captured and put in a lab.
Maybe I'm being too harsh, though. The first two games of a region usually are empty or have some issues, and the one(s) after usually fix a lot of those issues. I thought the region itself was beautiful. I liked being able to change my character's outfit, riding Pokemon, the XYZ trio, a lot of the music, and the Fairy type.
I really liked ORAS, though. They're my favorite games in the series so far