I have a question about the math used to calculate the benefits of the Executioner enchant for tanking. I'm sure this has been hashed out in detail before, but I could not find the calculations in this thread outside of the initial post.
840 armor penetration is roughly equivalent to a 5.6% DPS increase according to information posted by Kalgan.
According to the threat calculator, this comes out to just over a 6% total increase in threat for a well equipped warrior, or ~65 TPS. This would make executioner significantly better than mongoose for use on your “Aggro weapon”.
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I'm not sure how exactly the threat calculator works, I'm just going off some back-of-the envelope calculations. If the enchant provides a 6% increase in DPS while active, and is up 25% of the time, then the average increase in damage is less than 2%. That would imply that the increase in threat is closer to 2% than 6%, reducing the TPS bonus to 23.
It seems to me that the initial calculations for Executioner neglected to account for it only being up 25% of the time. Was that taken into account somewhere that isn't immediately obvious?
Edit:
Using the threat spreadsheet, I found the following results. I used the default values in the spreadsheet except where otherwise specified.
First, I couldn't find anywhere in the spreadsheet to input armor penetration. I therefore manually calculated that a typical boss with 7600 base armor and full -armor raid debuffs has 3590 effective armor and 23% DR. A boss with an additional 840 armor removed has only 18% DR from armor. I entered these into the spreadsheet and got the following TPS numbers for the maximum TPS rotation listed:
23% mitigation: 865 TPS
18% mitigation:
905 TPS
I then calculated the effects of mongoose. I added 32 haste rating to account for the 2% haste part of the mongoose proc. I attempted to add 120 agility, but this produce only half of a percent increase in "Crit" under "Buffed Stats". I instead manually added 3.63% crit to the base stats to account for the 120 agi from Mongoose and got the following stats:
23% mitig, +3.6% crit, +2% haste:
901 TPS
If we assume equal proc rates of 1.4 PPM, then we can just directly compare the TPS numbers. The two enchants are nearly equal in threat in this case. Assuming a proc rate of 1 PPM for Executioner vs 1.4 PPM for Mongoose, as listed in the original post, Mongoose become superior for TPS.
These results suggest that the TPS disparity between Executioner and Mongoose may be much smaller than previously calculated. If so, the dodge provided by Mongoose may outweigh the minor TPS increase in most cases.