Originally Posted by
AanvilGT
In raids you will have two tanks, and with tank swap mechanics you will frequently be able to cover almost all blockable attacks with only 70-80% shield block uptime. Nobody is suggesting you will be afk, but in many raid encounters haste's increase to shield block up-time will be wasted.
The stat weights favoring versatility were generated from AMR sims posted on page 146 of this thread. AFAIK the sims did not significantly consider dps or threat generation as a relevant factor. If you want dps over mitigation, haste is your best stat (after strength). If you look at the numbers, the total damage absorbed by Ignore Pain is by far the largest portion of our overall damage reduction. Versatility and haste have roughly equal contributions to ignore pain. A 1% increase to IP size is roughly equivalent to the increased rage spent and dragon scales procs on IP gained from haste. However, the damage reduction portion from vers was actually very significant in the sims, as it is always on and applies to all sources of dmg including magic dmg, and substantially outweighed any comparable increase to shield block uptime gained from haste, even on fights where that SB uptime is relevant. The AMR sims thus value versatility more than twice as much as haste for total damage reduction.
Many contributors to this thread have made strong arguments that the AMR sims do not adequately take into account damage smoothing and player control gained from haste. Simcraft results posted show haste's mitigation and smoothing value far closer to the mitigation value of versatility, but there is an ongoing debate as to the importance of several known bugs in the simcraft results. Until the bugs are fixed, you will have to decide for yourself.