Well MRD being on par with MNK/DRG would be plainly wrong but I like the flexibility to be a decent melee DPS without having to lvl another class.
We still do titan in my group to help new lvl 50 in my FC and being able to go as a melee DPS (with better gear than most of what you'd find in shouts or DF) is nice.
Especially, since I'm experienced with the fight, good at dodging and won't get hit too hard if I make a mistake.

If I can really only 10% less efficient than a DRG in equal gear, I'm sure my FC would greatly appreciate that.
Hell, I might even be able to offtank Garuda adds in MRD DPS gear. That'd be sweet.