DK is certainly powerful, but now another class has it, so it does lessen MNKs overall utility slightly. I do agree that well timed Mantras are useful. However, those two items pale in comparison to the utility that other DPS jobs bring.
You hit the nail on the head with regards to NIN/MNK/DRG. The fact that DRG has top DPS and also boosts MCH/BRD makes them a clear choice in any raid progression group.
