DRG has to gimp their power by subbing mage but DRK should sub SCH? DRK is an aweful solo job if you are waiting for DS timer. All the curing comes from the subjob and all the big offensive abilities are compromised. (LR,SE)
PLD even with a GS is a great solo job, pro/shell, Cure1-4, Phalanx etc etc.
SAM is a great solo job /DNC. Unlimited TP, Third Eye, EVA, Parry and SAM isn't defined by its subjob.
My Order would be
PLD > DRG > SAM > WAR > DRK > COR > RNG
