MRD seems to be one of the more gear dependent classes in game so far. WAR was like this in FFXI as where most of the "heavy hitters" like DRK, SAM, etc.
I am only 14, but phys is 23, I go DEX > STR > Vit (56, 43, 53 right now, I think). I tend to think STR has diminished returns from my reassignments so far, as I used to be STR > DEX > VIT. Upping my DEX while lowering STR improved my ACC a lot while DMG did not see to go down. It probably went up due to less missed swings. Also, I bought the 4 ACC rings for my level, copper, and have brass ready in storage. Upgrading to the level 12 Axe helped a ton too, as it has much higher ACC rating. Thanks to a friend, I have a spiked bronze waiting in storage as well now too.
Also, many other classes abilities seem to compliment MRD a ton and give us a lot of versatility.
With Stoneskin, Shock Spikes, Defender, Taunt, and Provoke, combined with multiple AoE abilities, I can tank really well for squishier friends, with a healer. Without a healer, I can still tank really well, but I drop either the stoneskin or the spikes for Cure and Second Wind.
Great must have abilities for MRD (some are situational):
Ferocity (I use in a macro with Bloodbath + Trunksplitter while solo)
I am sure there are others as well. Those are the ones I use the most right now, but I have not leveled Archer at all yet and do not have any other class past 10 yet. I do not think twice about attacking any orange or lower mobs yet... and many types of low red mobs (some Anglers for example) are pretty much push overs as well. I keep Defender on my bar all the time, as the benefits when it is needed, out weigh the lower attack and loss of 3 action points. If I need it, throwing it up, even at yellow HP can make all the difference.