Originally Posted by Thegoodman
The FFB mage has made the sacrifice to use a sub-optimal spec to benefit the raid. He should be rewarded as with the Focus Magic buff.
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All my attempts of understanding this pretty much failed.
Originally Posted by Pintofbrew
That's a very good question. It really depends if you're optimizing on one of two possible scenaria:
1) You want to have the maximum uptime for you.
2) You want the maximum Raid benefit.
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1) An Elemental Shaman will give you 100% uptime. Any other caster will give you around 97% uptime, Wrath Druids and Shadow Priests higher than that.
Affliction Warlocks are a bad choice because they spam Drain Soul below 20%, which won't produce any crits.
Since you have around 97% Focus Magic uptime, it is nearly irrelevant which class you put it on.
2) Check
SampleOutput - simulationcraft - Google Code to find out what 3% crit gives your partner.
In particular, find the
DPS Scale Factors table in the list and check for crit scaling.
You'll see what everyone has always said.
Frost Mages and Demo Warlocks are at the bottom.
Elemental Shaman have really bad scaling, just above them.
Destro Warlocks are next, followed by Druids and Arcane Mages.
Then Shadow Priests, then Fire Mages, and finally Frostfire Mages.
A Frostfire Mage benefits 2.6 times as much as a Frost Mage, and 1.9 times as much as a Shaman.
Also, there might be occasions where it's better on a healer. Maybe not now, but in the future.
If you focus purely on AoE zergs, you should probably stick it to your best Hurricane, Mind Sear or Blizzard spammer.
(Keep in mind that Shatter will crit-cap Blizzard in certain specs.)
3) The best ordering overall should be Frostfire>Fire>Priest.
You could stick it to your Shaman, but that means losing 25 RDPS to gain 4 DPS for yourself, which is pretty silly.