RDM provides great damage, offheals, great mobility, instant raises, manashifts at no expense, buffs physical party composition dps as well as itself ergo the only acceptable meta party composition. It wipes the floor with SMN and BLM. Will always have a spot and even better it's a no skill job.

Why waste a slot for any other DPS caster?

Makes my BLM sad because all we got is damage and I guess Manashift. And we can be AoE king all we want except the endgame content has lo and behold no real AoE situations outside of faceroll dungeons. Woohoo. >_>