Some things I like some things I don't agree with.

Don't take heavy armor away from MRD it really benefits our high HP pool and our aoe threat generating abilities.
I really enjoy aoe tanking as MRD, pure gladiators can't even come close to our aoe threat abilities.

I agree that our single target damage is lackluster compared to other DDs, but maybe its not meant to be. Whenever I get asked by my LS to hunt NMs as MRD I usually have the role of off tank and aoe tanking adds which is fun in its own way. (5-6 mobs hitting you at once and with full swing you're almost always at full TP spamming weapon skills every second )