Well, in my opinion RM is class just for support. I mean, I have 24 with my party already (in DoS, after class change) and probably RW is the weakest char in my team (K, RW, WW, BW). I remembered from NES version that he was very good char, quite big physical and magical dmg, good hp and mp and quite nice def. In DoS he's good physicaly but his intelligence is terrible, he does about 4x less magical dmg from spells than my BW. And (instead of NES version) he have a lot less hp that my WW. The only thing he's good at now in my party is supporting the rest like casting buffs, Nul-spells, status spells (like Focara or Confuse), healing etc.

So IMO RM/RW is, of course good character, but as acompany for WM/WW in supporting (having some BM/BW spells are big "+" for him)... Well, ok, and eventually fighting with his swordie ;p