Id rate it 9 out of 10.

First off the music and variety in locations is great. The best part about the storyline for me is the way that you have a charachter (Tidus) which you can relate to because hes new to the world just like you and you kind of learn along with him (or something like that):rolleyes2 . Another good thing is the Sphere Grid which made a nice change from the usual level up system.
I also loved the Blitzball side quest, better than the trading cards.