Originally Posted by Anias
Generally, haste will provide the largest real return on damage or threat output to any class up until that class reaches their personal cap on returns. Some classes may find other stats which provide equivalent returns, and should carefully weigh the advantages those other stats have vs the secondary burst potential haste provides. As an example, hit rating for warriors provides similar returns, along with a secondary benefit of stabilizing rage flow and threat flow.
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I think this is only true in absolute terms for melee DPS.
I know for warlocks that +1 haste ~ +1 crit rating ~ .5 hit rating ~ .5 +dmg ~ .5 + shadow dmg in a destruction heavy build (with a lot of time spent spamming direct damage nukes). For affliction haste is worth about the same so it is fairly resiliant to spec differences, unlike +crit.
I'm not sure about mages or other caster DPS but any class that deal heavily in instant casts or DoTs, like shadow priests, will probably see fairly small returns to haste as well.