From what I gathered: A good game with a great core gameplay and some nice changes... but:
The story is shit
The Wild Area is not only empty, but is visually inferior to the main routes and towns, giving the game a very bad contrast between those places.
The Wild Area is a technical mess: Popping is everywhere, textures are awful and the fog is so dense you sometimes can't see past your nose.
The National Dex is gone.
Endgame is short and lame.