Originally Posted by crimsonsentinel

Spell haste affects only 1 spell in a shadow priest's lineup: Mind flay, and that one spell usually only comprises of around 25-35% of a shadow priest's damage. It has no effect on his dots, nor on his nukes, so point for point, +dmg is vastly superior to spell haste for shadow priests. Until something comes out that scales DOT damage (which, given what the devs have stated about DOTs, is unlikely) other than +dmg, shadow priests will stay a one stat class.