"wow style" is misleading; FF fans already know this from FFXI.
Of course some jobs will be OP while others will be looked down upon, that's fine as long as it's not blatant to the point where it feels on purpose.

As for everything else, they should not design jobs around savage/ultimates; instead they could have 2 modes for jobs like they do for pvp. One balanced for raids, one balanced for non-raiding (this one is the default for the game).