I know we've got a few threads going around but wanted to pen down some of my thoughts and encourage others to do so as well.
PLD:
This job actually seems fine TBH. HP effecting Spirits Within potency is somewhat questionable after removing it from Upheaval. Sheltron may end up being busted at higher item levels as PLD block damage increases.
WAR:
Nascent Flash being tied to Raw is questionable. Quite frankly it would've made more sense to have Nascent Flash replace Inner Beast but include the option to simply be given to a target at reduced potency. The self heal seems rather inconsequential. Onslaught needs Beast gauge cost removed, or potency increase to 225. As it stands 20 BG is worth a minimum of 216 potency.
DRK:
Rework not enough. Remove the DoT from GNB and give it to DRK. Dark Missionary needs to reduce all damage 15%, not just magic. Dark Mind should have 2 effects like Thrill of Battle or Camaflouge, since fluff mitigation was neutered, or apply to all damage types. LD needs to be re-evaluated in some capacity, either make it stronger/less punishing to justify 5 min CD or lower the CD to justify using it more freely.
GNB:
Camaflouge parry buff is questionable, 10% flat reduction is nice but CD may be a bit too long. Need to see this in action to gather much else, it's sounding like it may need some help in DPS but really it's too early to tell without getting our hands on it. Auto shield from combo seems really great.
---- Other thoughts
I find it incredibly odd that GNB gets 3 combos and 2 DoTs while DRK was stripped of everything but Souleater combo, there is more than enough room for DRK to get Scourge back. And please stop with the physical/magic damage type separation, we tank both types in all the different content.
Missing a lot of our old fluff mitigation CDs, which is a bit sad, although I suppose it's somewhat offset by constant 20% damage reduction. It's just going to be hard to "feel" how effective the new tank stance trait is, since we won't really get to see how much damage we'd be taking without it.. Nor will we have any interaction with it (which honestly I may just value higher since WAR doesn't have a lot of oGCDs, fluff mitigation was practically all we had to press between our attacks >.>)
Other than that it's seeming fairly well balanced, just a few minor tweaks to help bring the tanks more in line with one another.