It's good for a $30 survival game.

Huge world map to explore, a variety of different monsters to capture, bosses to work up to, automation that allows the more annoying parts of survival games to happen in the background as you explore, space to fiddle with the monster capture stuff through breeding and condensing.

A lot of people I know enjoy it for the shock value of pokemon-with-guns that you put into a sweatshop and then butcher, but you don't have to do it that way and it can just be a not-pokemon game where your gardevoir helps you craft stuff.