The problem with XII is that there is no closeness there between the cast. Sure, there's the small closeness between one or two members (Penelo and Vaan, Balthier and Fran, Ashe and Basch, Balthier and Vaan), but overall you don't see the group being the typical Final Fantasy cast.

Take a look at Final Fantasy VIII. Squall eventually opened up to every member. Even in Final Fantasy IX, Zidane and Steiner opened up at one point. Even Quina and Steiner had moments where they talked. In Final Fantasy XII, you see Bash and Penelo talk maybe once that I can recall. And I don't think you ever see Ashe talk to Fran except maybe in Eryut Village.

XII remains my third favorite F.F. title, but the cast, while interesting as individuals, really really.... well, sucks.. together.