It is excellent though I personally prefer 7 and 8. It has somewhat more comic graphics and a fun feel to it. The battle system is class based, each character has there basic job though some characters can be good in multiple areas. The story is excellent and while the characters weren't great in my opinion Vivi was amazing. It's a good length rpg, maybe 50-70 hours your first time through, and possibly longer if you haven't played many rpg's. It's an enjoyable game that get's less attention then I believe it should. I'd say it's slightly worse than FFX but definitely far better then FFX-2. It's strengths in my eyes are an excellent villian, storyline, and if it fits you a great fun feel. Oh yeah, wonderful FMV's.

Edit: You should remember it's a ps1 game, so if you haven't played ps1 games before the graphics will be weaker though I love the style.