Most folks will tell you that it's a bad game and I'm one of the few that actually liked it. Very linear, to the point where there is no exploration or freedom for the first 25 hours or so. After that point it opens up to some degree, though even then your options are limited compared to past Final Fantasy games. The story and characters themselves aren't bad, but are presented in a fashion that was slightly confusing at times. Combat is somewhat shallow, but at the same time I had a lot of fun with it.
I'd say it's worth checking out. It's probably hit bargain bins by now, and I enjoyed it for the $60 I paid at release. It's just not your traditional Final Fantasy game.