A lot of reviewers are upset and are going to spam 1/10 on every site they can because they are missing the National Dex in the game. The game isn't built around having all your previous Pokémon in the game. The gameplay is a good as ever (if not a little on the easy side), the animations are great, the region is diverse and the introduction of a host of features means a big step forward for the franchise.
Do I think game freak messes up by not including every pokeMom from previous gens in the game? Maybe. But the game surely doesn't deserve anything less than a 5/10.
I've enjoyed this game all the way through to where I am now (7th gym). I would recommend to friends who play Pokémon.