I think the only complaint I sort of got, was that the post-game was kinda small. But I spent over 300 hours before beating the E4, and there are more to come, so its not that bad^_^
At first I thought the Fennekin line would be my favorite starter line this gen. Because it mixed foxes(My favorite animal, Kyu~!) and mage(My favorite RPG playstyle), Fennekin and Braixen are frikkin adorable, but Delphox is, I don't know, it's cool, but, it's lacking in some aspects.
Now, I chose Chespin as my starter, because Code already chose Fennekin, and I didn't want to copy(Talking about that, I got the game 1 day before the official release, and I paid for Code's Y version as a gift ) and I loved the little fella, and Chesnaught is also so adorable looking X3
But I guess the Froakie lin is my favorite when it comes to battling, thanks to Protean. And Greninja is awesome looking with its tongue scarf
But I don't really have a "favorite". All are equally on my #1 spot of favorite Kalos Starter XP