It's kinda hard to talk about this one. It's pretty much the quintessential JRPG.
It has a great cast of deep, well-developed characters - each of them has a lot of background. Great overall plot, original and dynamic. Beautiful art, varied and fun gameplay, lots of sidequests. The best soundtrack Nobuo Uematsu ever made .
And one much-more-than-awesome, you'll-love-to-hate villain.