I wouldn't say the music is bad, but different from the other FF games.

The songs in this FF12 game is not heavily Wagnerian as did all other games where each song would have specifically described a character or an event. That was what get me interested in FF music, too ^^
Because Nubuo Uematsu-san has successfully incorporated the drama into music, rather than being just absolute melody, so even if you aren't playing the game, you would have a pretty good idea what's going on just listening to the tracks.

But, you can do that (sort of) with the tracks in FF12, too. I really like the theme they have when they fight the summons!

BTW, I think they were intentional in making Aeris theme the same as the ending theme of the FFVII game because Aeris, after all, plays an EXTREMELY BIG ROLE in the game. Actually, they have been using the themes of the heroine as the ending themes for the game series since FFVII to FFX (Aeris-Pure Heart, Rinoa-Eyes on Me, Garnet-Melodies of Life, Yuna-It's Beautiful, Isn't It) <-I guess I was just disappointed that Ashe didn't get her own song