So, after getting to stack 2x Runes and using Lunge, I can see what Lunge is, a hate tool. BUT The recast to be a hate tool may be just a bit too long. (Yes, I realize the damage it can do and how reducing recast could be "broken")
Secondly, the job has no shield, no heavy armor, yet it's referred to as a "tank". Do I think RUN should get heavy armor, like PLD does? No, I do not. We can get quite a bit of good gear at 99, including a bit of Damage reduction/Physical damage reduction, and we have defensive magic, Protect I-IV, Stoneskin, Phalanx, and even the new Foil for special attacks. We also have A+ parrying skill, which is where I've become disappointed, I don't exactly know what Inquartata does or the rate at which it does it, but I do know the maximum Parrying rate is 20%. I feel that for RUN to be an effective and feasible tank this will need to be raised...drastically. I understand RUN is meant to be a tank against magic, but there aren't really mobs that ONLY use magic, RUN needs enough survivability to withstand the physical swings between a mob's spells.
I know I'm comparing RUN to PLD here, but PLD can get a hard cap of 65% block rate, 100% with Ochain, under certain conditions. I'm not suggesting we raise Parrying rate to 100%, I'd suggest a rate of around 55-60%.
So far, I really like this job, I like the way it works, I like the idea behind it, I want to see a new tank job thrive, be successful, and have a place in a party, but unless RUN can survive the physical hits it takes, I think it's doomed to become a back-up tank/DD/support, and we have enough of those.
Edit: It appears Inquartata does increase parrying rate to some extent. I'm neither capped at Parrying, nor good with math, so how much it increases, I don't know.