Star Ocean, Till the End of Time. I bought it by accident and found myself emersed in the story line before I could return it.
It starts a little slow, but if you pay attention and just keep goeing along, pretty soon, things start to happen. I won't go any further, else I get angry e-mails from people about spoilers :P.
What supprised me the most was the gameplay, I've never liked turn based games and didn't think this would be different. Well it wasn't. It's a creative blend of turn based (running into the monsters and entering 'combat mode') and real-time fighting. It's simple yet not to the point where you get bored with it, there always seems to be new monsters and the like to get in your way.
I didn't really find any serious problems though. It's everything you'd expect from an RPG and more.