Hey all, Swol from AMR here. I have been getting a lot of questions about mastery for outlaw rogues for pretty much all of legion. We have always ranked it as a very good stat, but people are very hesitant to believe it!
Here is an explanation of why we recommend a lot of mastery by default:
TLDR version first.
If you have no legendaries or set bonuses, Mastery is the best stat.
If you have Greenskin's, Mastery is the worst stat, Crit is the best stat.
If you have Mantle, Crit is the worst stat, Haste/Mastery are about equal.
If you have Mantle and Greenskin, Crit is the worst stat, Vers is the best stat. Haste/Mastery are about equal.
If you have 2pc and/or 4pc bonus, Mastery's value goes down a bit.
There is no one set of stat priorities that will always work! You have to take into account special items.
The first thing I did was a complete overhaul of the outlaw rotation on AMR. My original one was pretty good, but, it was missing a few refinements. I looked at the SimC APL for outlaw rogues as well. I incorporated some of the refinements found there, and removed the logic that was not actually increasing DPS. The resulting rotation is easier to read and does a good job at not wasting resources. Here it is:
http://www.askmrrobot.com/wow/theory...w&version=live
Now I have a rotation that chooses the same actions in AMR and SimC, and which also gets optimal DPS by following the general rotation logic that top rogues are using. So, this is not an AMR vs SimC discussion... both simulators are in agreement on these results. If you simulate the same gear in both simulators, you will see the same actions chosen.**
I did a series of simulation batches. I used approximately 885 item level with no special trinkets that could influence results. I kept the secondary stat budget fixed and sampled 100 different combinations of stats randomly, allowing any given stat to be as low as 2000 or as high as 14000. Of course, very high versatility sets are hard to get unless you PvP, but they are included for theoretical purposes. I used the highest damage talents for each setup. In general, that means Ghostly Strike, unless you have Greenskin's, then use Quick Draw.
No set, no legendaries:
http://www.askmrrobot.com/wow/simula...de99d332dbef85
No set, no legendaries with Quick Draw - just to show that the talent itself doesn't influence stats:
http://www.askmrrobot.com/wow/simula...090167797ad6ac
Greenskin's only:
http://www.askmrrobot.com/wow/simula...c1cdcfbebae3d5
With Greenskin's, Between the Eyes becomes a decent contributor to DPS. This means less attacks that proc mastery and also a spell that scales very well with crit. As a result, we see that putting as much of our stat budget into crit as possible becomes optimal.
Mantle only:
http://www.askmrrobot.com/wow/simula...8c597cf2243f5d
Here we see the obvious result of having 100% crit for some portion of the fight: You want to avoid stacking crit rating on your gear.
Greenskin's + Mantle:
http://www.askmrrobot.com/wow/simula...69a04786f43b77
When we combine the crit-loving Greenskin's with the crit-hating Mantle, we see the predictable result: get Vers. Mastery seems to be the next best stat, with Haste not too far behind.
2pc only:
http://www.askmrrobot.com/wow/simula...7e77ad485c0bdb
4pc only:
http://www.askmrrobot.com/wow/simula...f8a157a6ac90cb
The set bonuses both reduce the optimal amount of Mastery you'd want on your gear. This makes sense because you have less need for the energy from Combat Potency.
4pc + Greenskin's:
http://www.askmrrobot.com/wow/simula...5f425664c1613c
As expected, avoid Mastery like the plague, stack Crit.
4pc + Greenskin's + Mantle:
http://www.askmrrobot.com/wow/simula...762eeaf23ba5c3
At this point, the stats you get just don't matter much! For those who really love to min-max, get as much vers as possible.
The simulation results speak for themselves - and the fact that both AMR and SimC agree on these results should give people some confidence in them. My assertion that Mastery is the best stat for Outlaw rogues has always been qualified by: If you don't have specific legendaries or set bonuses. I did not include an exhaustive examination of how relics might also affect this - I'll leave that for another day!
**AMR and SimC are two different models of the game. AMR was written to incorporate some more human-limited reaction time and decision logic. As a result, you will always get slightly more DPS in SimC, since it squeezes out a couple more actions over the course of a simulation. Conversely, AMR will usually match what you see in logs more closely (although comparing combat rogue sims to logs is almost pointless because of RtB). This does not affect results in any significant way, from my testing, for outlaw rogues. If you perform all of the tests linked in this thread in SimC, you will get the same results. I have spot-checked the results and SimC does, indeed, agree that the high mastery sets of gear simulate higher for the no-set, no-legendary setup.