Favorite things:
The graphics: I'm not one for amazing visuals but seeing the pokes in 3D and cell shaded is awesome!
Breeding and training: EV, IV and other aspects have never been so approachable by players trying to get into competitive and optimal stats and natures.
Dragon's getting hit with the Nerf Bat and Poison's getting a much needed buff all thanks to fairies.
Customization to your characters clothing, if somewhat limited.
Least Favorate things:
The somewhat lacking end game content.
The slowdown on multi battles, at times the frame rate is shot to pieces.
The lacking Gen 6 roster of new Pokémon.
Still having to play as a young kid.
Team flare...