A RDM using something on the order of Cloud Splitter would be pretty good. Not quite as potent as Wildfire due to WF COR's cheating and using an Ifrits staff, but close. 40% STR / MND favors and being a MAB WS favor's RDM's greatly over BST / WARs.

Heck just look at Sang Blade and Aeolian Edge for a good idea of what a RDM can do on their own. While our melee gear is somewhat sh!t our mage gear, especially MND and MAB, is beyond awesome.