The devs try to balance things such that the more the more personal DPS a job hasd, the less raid utility it has. Like when Choosing between the 3 Melee DPS, Monks damage is the highest while Ninja's is the lowest, but Ninja has more tools for helping out the group than Monk does.

At this point I don't think any of the DPS are too weak to compete though, so you don't have to worry about bringing your team down if you decide to play as Ninja instead of Dragoon or Monk.