I'm glad people made mention to the refresh bot in XI. It removed RDM from all of it's supposed characteristics (in my opinion). Also, it is my feeling that Giantbane is absolutely correct. A jack or all trades wouldn't work in the current system. Call me crazy, but I think RDM would make a great (and sorely needed) tank. Uses melee attacks and white and black spells would either add threat generation or provide some defensive capabilities. I imagine something between PLD and WAR. Instead of full on mitigator or full on aoe tank, you get something inbetween. I realize this contradicts the jack of all trades statement, but I leave it to the developers to work it out.

TLDR: I think the best fit for RDM in the game's current state is a tank. Just my opinion.