This game gets a ton of hate, why? Probably the lighthearted nature of the story, I think the female leads also play a part in that. This game, is by no means bad. It's a good game. It really is. The story is great, because it wraps up what happens with Yuna and Tidus at the end of Final Fantasy X. As well as giving us more time to see the characters in FFX and what they're up to.
The gameplay is THE BEST, in the series. This is the games strong point, the gameplay itself. And isn't that what games are about? Obviously not. Hence all the hate for this game. The garment system is great. It's basically the job system revived and perfected.
Give the game a chance. It gets hated on for all the wrong reasons.