Originally Posted by Charger525
ive been rackin my brain and tryin to read thru all the posts here, please forgive me if im posting in the wrong section. but whats the consensus for DKs and arpen? is it a useless trait? if not and we do need it how much should we shoot for? currently I'm a blood specced tank and i have some arpen thru my wep and but im just tryin to find a NO BS (or close to it) handle on what the story is for arpen and DKs Please help and or advise. Much thanks... attached is my wowarmory link if its of any matter or importance. Thank u again.
[url="http://www.wowarmory.com/character-sheet.xml?r=Gorefiend&n=Cyrak"]
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Armor pen is a stat which you, as a tank, should avoid. Don't by any means avoid it like the plague (ie, don't ditch some ilvl 232 weapon for a 226 weapon just because it has armor pen on it). Armor penetration becomes better the more you have due to its ultimate effect on bosses and at which point during the damage calculation process it occurs.
Since you asked, even though it isn't really pertinent to the overall situation, you should aim for (generally without socketing) about 495 armor penetration with Grim Toll, or 442 with Mjolnir Runestone as one of your trinkets in order to successfully reach the armor penetration cap (while procs are up via trinkets).
There is a debate as to whether it is worth it to gem for armor penetration as a dps blood spec user, but there has not been significant math proving at what point one should gem for armor penetration (though the number 6200 raid buffed AP gets thrown around a lot), and the majority of the math shown so far suggests that the difference between strength stacking and armor penetration stacking is very minimal at best. Also, as Darkside/Kroot has said multiple times, the ability to shift between specs makes Str more worth while to gem for (because armor penetration is a fairly poor stat for unholy, and strength is better to stack for frost due to its inherit magical damage).
For more information on armor penetration from a dps perspective, check out
http://elitistjerks.com/f72/t61176-b..._dk_dps_guide/ which has all the number crunching and tens of posts directly related to your questions regarding armor penetration.