Absolutely loved this game. I felt like the quest line was intriguing and the open world aspects just absolutely incredible. I was also amazed by the amount of content in the game as well as (spoiler warning):

The game had one of the toughest trainer battles ever. Volo is up there with Cynthia in the franchise for me. Seriously - the battle and then going into TWO forms of Giratina with no rest was sooo difficult. Took me a couple of hours to eventually win it.

Also caught most of the legendaries minus Enamorus and Arceus. Enamorus just kept consistently made itself so difficult to catch, so I ended up giving up.

If you like Pokemon at all, it's definitely worth playing.