... As a DK DW tank, you also gain NOTHING.
I will try again, hopefully people will bother taking the time to read & understand it, rather than think i'm arguing for the sake of it, or because i dont know what i'm talking about:
2x Mandible of Beth'tilac (378) gives:
+350strenght (which also grants 87.5 parry)
+524stamina
+198mastery
+252dodge
1x skullstealer greataxe (378) gives (AFTER REFORGE):
+408strenght (which also grants 102 parry)
+611stamina
+265mastery
+110dodge (reforged from haste)
+166 haste
So, going from a 2h setup to a dw setup, what do you gain? 142 dodge. What do you loose? 58 strenght (which also includes loosing 14.5 parry), 87 stamina, 67 mastery, 166 haste, AND THREE TALENT POINTS, assuming a "dw dk tank" would be putting three points in nerves of cold steel.
In pure defensive stats, you loose 14.5 parry, 87 stamina, and 67 mastery, to gain 142 dodge. In absolute numbers the 2h gives MORE defensive stats (168.5 vs 142), after weighing stamina at 2/3rd the value of dodge/parry/mastery you end up with 139.5 vs 142. If you consider that mastery should weigh a tiny bit more than dodge/parry, there is essentially NO difference in defensive stats between 2x 1h tanking weapons and 1x reforged 2h weapon.
However, you ALSO loose 58 strenght, and 166 haste, which by itself is already a non-trivial hit to your dps/dmg.
If this is where the comparing ended, i wouldnt be so bothered by it. I mean, they would provide an similar amount of defensive stats while the 2h also brings more offensive stats through strenght & haste so to me there would be no discussion, but i wouldn't be so opposed to people discussing it, especially considering pure avoidance builds.
However, this is not where the comparing ends. After the above (same defensive stats, more offensive stats on the 2h), there is the tiny little HUGE issue of a dw only using his main hand for his abilites. So after already being behind in the stats department, you're cutting 40%+ from any ability damage that you do. To gain... nothing.
And because i'm sure that someone will argue this... I'm not opposed to pure avoidance builds. But if you're so die-hard about it that you're willing to make the above trade-off... that's the wrong choice.
Also... This is as clear as i can put it. If people read & understand the above and are still arguing that dw in any shape or form is something that merrits mentioning, i'm gonna bash my head against a wall and call it a day.