The greatest RPG I've ever played. YOU GET TO FIGHT GOD.
At least at the end, you do.
Although, finding the original is hard.
I recommend Shadow Hearts 2: Covenant if you're just getting into it. The first is heavy on the horror/gothic genre. They just keep getting sillier and sillier.
What sets it apart from most other RPGs, aside from the expansive story and the depth of the characters, is the Judgement Ring battle system. Really, it is just a fancy game of Wheel of Fortune where you have to stop the spinner in one of the designated areas to accomplish feats and get critical effects.
There is so much to do in these games, I'm still playing them. The only thing I can find similar to it is Final Fantasy VII. The game is about the same length, in case you're wondering.