So . . . what was it you felt was the worst game in this series?
Personally, while I don't think is the best game, I certainly find it a good one. I do agree there seems to be virtually no point to Vaan or Penelo, whereas Ashe, Basch, Fran, and Balthier do have points. Hell, even Larsa, a guest character, has more point than Vaan and Penelo.
The game could use more humor, though. Only laugh I've ever gotten was when Vaan asked . . . something he shouldn't have.
That said, I actually like the music in this game much more than I like the music in any of the other games I've played (which have been V through X).