Grandia 2 was a great game with a fun, fast-paced and tactical battle system, a decent story and some cool characters (loved Millenia and Mareg).
However, for me the first game is still one of my favourite RPGs of all-time. A lovable cast, a story with a truly grand sense of adventure (with the right music to match its scale), and a solid battle system (though later games would improve on it massively).
On a side note, the third game's story was very clichéd and uninspired, and most of the characters were forgettable (perhaps a sign of the times when it came out?), but I got through the game purely on its battle system, definitely the best iteration of it in the series.
Man, I yearn for another game in the series, or even one that takes the third game's battle system to the next level.