I probably wouldn't be wrong if I took a quick look at XIII and say that the party isn't job based like some of the former FF games. I haven't touched the game myself, but by going on the character designs and what I know about the combat I can assume that this game lacks a class based-structure.

Out of all the FFs I really like those that stick to making the party individually different to play with. In games like VII, VIII, X-2, and XII your parties lack unique playstyles and everyone can feel like clones. X-2 may not exactly be like that, but all three of your party members can have any job leaving only their limit breaks (special dresspheres) for individual playstyles, though some of those can be alike too. XIII probably falls on terms with VIII and VII in this category. I don't know if they have limit breaks to separate themselves at least a little bit in the game, but if they don't then I guess it's a worse case.

I still have fun with those games, but it always seemed a little funner if my party was designed for specific roles. IX, X, and IV. I really enjoyed because of this. VI seemed like it also went with that structure, though anyone can cast any spell or summon in that game. Umaro was the only one that really seemed confined to his job (Beserker?).

The question here is would you like to see more job-specific FF games in the future outside of the MMOs?

I certainly would and we need something very unique for that cast instead of something predictable that the last ones followed.