Originally Posted by Dirich
For sure there are classes which benefits more than shadowpriests from spell haste, and probably +damage is still the best stat to agument their dps, but still, i wouldn't say that spell haste gives small returns to shadowpriests.
For what concern affliction warlocks, having 4 dots (2 instant, 2 with 1.5 casting time) plus an instant curse, probably 2/2 Nightfall, and some time spent using Life Tap / Dark Pact, probably the effect of spellhaste is a lot less noticable. I agree on this point.
P.S. Assumptions
1) Haste do not affect GCD (otherway MB and VT would be also positively affected, resulting in only VE, SWD and SWP not being affected by spellhaste)
2) Shadowpriest goes all out, otherway it would be more MF and less SWD/MB, meaning more time spent channeling (so more benefit from spellhaste)
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Agreed. A Shadow Priest probably isn't going to see huge returns on Spell Haste, but the biggest point is that you can squeeze in more Mind Flays in between DoT Recast. Heroism adds a huge spike to Shadow Priest DPS, but small amounts of Haste Rating from gear are more likely to wreck a good DPS cycle than anything else.
Any Shadow Priest that's been playing for a while knows about the "how many MF's can I fit in between MB cooldowns", and messing with talent points in Imp. MB. Either you're wasting MF ticks hitting MB as soon as it's on cooldown, or you're leaving MB off-cooldown waiting for another full MF. It's a substantial amount(50%?) to get a Shadow Priest to run into the global cooldown spamming MF, but it's probably a lesser amount to make cycling spells a problem.
Edit: Sort of a tangent, but Haste Rating could make a Smite-heavy build very interesting, given that there's two more spells with no cooldown to cast.