no, it had nothing to do with the graphics. i didn't even know there was a difference in graphics. as games, not comparing it to the originals, i enjoyed them and maybe that is because i don't know what was changed with the porting. thats all i'm saying.
actually, i liked grandia 2 because of ryugo. i don't even remember the plots, only the way i felt about the game at the time. and grandia 1 left a bad taste in my mouth. yeah, the kids didn't help, also those 3 soldier ladies were annoying. that one amazon chick that joins the group who's husband is a giant walrus (or was he a yak? i don't remember) was stupid aswell. overall, the characters in the game did nothing for me (and excuse me for not remembering names of characters i didn't like).
and grandia 1 has a better plot than grandia 2? that would be your opinion.
i do agree, however, that the lunar series is better than the grandia series as a whole.