Nothing about it is broken, but def aimed at younger minds. PG-13 themes told in a PG manner.
The battles were fun, and the voice-acting was above average. Character and background design was average, as you can see from the images here on Gamespot. What spoils the game was that everything story-wise - cut scenes, plot, etc - had that sheen over it. You may know what I'm talking about. The creators come up with a story that an adult *could* enjoy, but it is clearly watered down so as to be suitable for the PG crowd of 7-12 year olds.
Sometimes this is acceptable. Sometimes, as an adult, if a game is constructed well, you overlook (or even buy into) these concessions. (Hey, game makers have to make money, and reaching a wider audience is something video games and anime makers always try to do, much to the chagrin of people like myself.) In Grandia III, however, it was not to be. At least for me.
If you're looking for an adult game, you will find something more like a Saturday morning cartoon here, with attempts at humor and drama that don't really strike the right cords.