First of all RDM is not a "hybrid jack of all trades something something", RDM is a ranged caster DPS class in this game and if you are hesitant to understand that I'm forced to question your analytical capabilities already.
Second -- RDM has literally the same DPS potential as BLM and I mean it, only few RDMs could actually pull off better numbers than BLM and those would be just 50-100 DPS higher at best. So you either need to get better at your job or just pick one that's easier to play, if you aren't capable of perfoming well.
And lastly to people, who think that RDM has low AoE, that's incorrect as well. Just do the math or learn the way to use your abilities correctly for 3/3+ targets.
RDM is currently the most balanced job in the game, if anything some other jobs should get adjusted slightly.