Worst main game by far in the series. Felt rushed as hell. Best multiplayer and metagame tho.
EDIT: I should explain myself better. Reasons for being the worst:
-Complete and utter lack of postgame
-Heavily lacking atmosphere. I didn't like the Kalos region much.
-Too streamlined. Not many side things to do, and not an engaging enough story to make up for it like BW had.
-Too bloated. 150-200 is the magic regional Pokedex number. 450+ is just too much by far.
-Mega Evolutions are a fun postgame concept. But they're not very fun in the main game, especially with being limited to only 10 of them for the duration of the main game.
-Too easy. Exp. All is a great idea for the post game, when you're trying to complete the Pokedex, but it just makes the main game ridiculously easy.
-The Camera really hurt some locations. Overhead camera would've made it so Lumiose wasn't a fucking headache, and a better placed camera would've helped fix the worst area in a Pokemon game, Azure Bay.
-The game gives you too many Pokemon. If you use your starter, the Kanto starter, and the Lucario given to you to show off Mega Evolutions, you have half your team given to you. And it's kinda hard not to use them, because they're all excellent to use.
My general opinion is still RSE=FRLG=BW>DPPt=BW2=HGSS>XY.