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with regards to the parry numbers, i haven't run them personally but i've seen a couple threads on the damage intake. unfortunately the chance for higher burst damage exists, but the fact remains that in general a dw dk supposedly will parry less than or equal to a warrior, not to mention the avoidance on those parries. numbers run show a 1~2% damage taken increase, with the number being set at 2-5 parries more per encounter. There were threads on mmo-champion about it which supposedly cross referenced something in either EJ or tankspot (cant remember which).
just to set a record here, i do not dw tank, or dw dk at all at the moment (dont feel i'm geared enough for it yet to try it either), and i have no plans to dw tank either.
what i'm trying to say though, is that because crushing blows are out of the game, the parry gibbing IS an issue, but its nowhere near as bad as it was in tBC. The problem in tBC was forcing the boss to haste and getting crushed (mostly through blowing shield block charges).
Also, blue posts have confirmed that not all bosses have parry haste anymore (just parry), patchwork being one of them.
All I'm saying is that we need to be a little more objective about dw tanking. i'm personally not going to try it but there's bound to be some theorycrafters out there who could present a good case for it, and its possible it could work for some people. but like i said before most DKs shouldnt try it unless they know the game mechanics very well and are willing to put the effort/gear into working it.
Edit:
Parry does not mean the boss gets a free instant attack. I don't understand the mechanics exactly but i do know that parry haste seems to be based on how long till the boss's next attack. if the boss got a free instant attack on you then it would suck, but as it stands now you just get hit a little faster on average, and in best case scenarios its a very low amount over the course of an encounter.
I'll try to find the threads and repost them later.
The problem isn't the average increased damage in an encounter, it is the existence of unmanageable, unpredictable burst damage. Getting hit 3 more times doesn't seem like a big deal until you remember that those 3 hits could all come in direct succesion. How much a healer HoTs doesn't matter if the tank is just gonna get bursted down. A boss is far more likely to take out a tank before a healer can react when the tank dual wields. Twice-three times as likely, depending on your weapons. It may not happen often, but it is far more likely.
I mean, a boss will still parry a 2-hander 15-16% of the time (expertise aside). The difference is that there are 3 seconds before he has another chance to parry where he can do it again with DW very quickly. And, possibly again before the 2H swing.
Plus, since they are adding tanking 2-handers to the game, there is no reason to go for the 1-handers.
From what I understand, parry gibbing works this way:
The boss has his swing time, which begins with a swing. Let's say he has a 3.0 swing timer.
He swings and hits you and then parries you quickly after that (<1 sec into the timer). He doesn't parry you again during this span because your swing speed is >3s. So, in approximately 4 seconds, you get hit 3 times (1 at the beginning, 1 for resetting, 1 for the start of the next timer). Now, Parry gibbing will almost always result in more damage, but it is far worse if he parries you just after a swing than later on. See the next:
You have a 2.0 second MH and a 1.8 second OF. Boss is still 3.0.
Boss swings. Just after that, you swing and he parries, hitting again quickly. Your OH swings also, getting parried, causing you to get hit AGAIN. 1.8 and then 2 seconds later, he parries both attacks.
You get hit 5-6 times in the same 4 second span.
Even if you get REALLY SLOW 1-handers, you double the chance of this kind of burst attack from happening (though it isn't as bad).
Plus, you need to factor in abilities that get parried.
A boss likely will parry you 14-16% a battle (trash is trash and I'm not gonna worry about it here). That results in 14-16% of your attacks resetting his timer. If you get really slow DWing weapons, it will be about twice as many parries.
This can add to a small amount of increased damage, or it can lead to a huge amount of increased damage in a very short period that isn't predictable.
But, damage WILL go up either way.
There is NO POINT to go for defensive DWing when you are going to take more damage that is not made up for by the extra avoidance.
If Blizz changes parry glibbing, DWing may become viable. Until then, don't do it.