I always assumed the problem with rdm was that SE's paradigm for them is to be jack of all trades and master of none, and in the min/maxing world of ffxi master of none kind of sucks, meaning SE's idea for rdm is for it to suck...

which I think is stupid to design a job to suck, but I cant readily think of a new idea to fix rdm that wouldnt subtract from its versatility or make it OP

but then again my rdm isnt above 60 yet so maybe my understanding of it is totally skewed, just thought I'd post my thought on it since I hadnt seen it mentioned yet
I do like rdm and hope SE eventually gives it some nice toys that are exclusive to the job, but somehow I see this being a lower priority for the dev team than finishing the up coming new jobs or rebalancing other jobs :/