Grandia's gameplay deservedly gets a lot of focus, but I think its story and characters are pretty fabulous too.

For me, there aren't many better "boy goes on a big adventure and becomes a man" type JRPG stories out there, and it has a sense of high spirited adventure about it that a lot of JRPGs try for and not many succeed in actually conjuring up. The cast seem a bit annoying at first, but they really grow on you as the story goes on, and I think the character development of the two main characters is actually handled super-well, with them genuinely feeling as if they grow and change over the course of the game.
Admittedly the awful, awful English voiceovers kind of ruin it, as does the slightly ropey translation (it's good for the first half of the game, but seems rushed in the second half), and it's undeniably more than a little corny at times, even in Japanese. But I still think the story and characters are really, really nicely done in it~