This thread is like two months old, but I'm going to give my opinion anyway. :P

If you're the type of person who actually cares about stories in games and you liked the outcome of Final Fantasy X, you might want to skip this game because it completely ruins it. A few of the minor characters from X get more development (though I'm not so sure that's a good thing in the case of Brother and his incestuous crush on Yuna) and Payne is ok (if you don't mind the fact that she's basically Squall with a vagina) but the only other new character I can remember is a little creature named Tobli. I think there may also be a Hypello.

If you don't care about stories, you may or may not be able to stand the overall atmosphere anyway. It's like playing a Fantasy version of the Spice Girls movie.

Not only does the game mostly involve backtracking over the same few areas five time (that is, if you want to experience the whole game) but they're the areas that you already played through in Final Fantasy X. The game feels really lazy in that regard. Others, too. A lot of scenes that would basically require motion capture acting to not be incredibly awkward just don't have it. Lulu is pregnant and Wakka is fat, but neither of them look any different than they did in X.

If you can get past that, though, the gameplay is pretty good. The battle system is fast paced and frantic and the job system is great. I love that you can switch your job in the middle of a battle. It adds a lot of versatility.

Overall, I think X-2 could have been a great game, but instead ends up being a great game engine wasted on Spice World.