Originally Posted by
davesignal
Yes, the point is it takes two minutes to reach maximum damage. It has a ramp up time. Ramp up time is the trade-off for the fact that it will be ticking away regardless of your movement, and that it would do so much damage that it doesn't really matter if you're casting Mind Flay: Insanity far fewer than COP or AS.
That's the entire point-- to make the focus of the spec maintaining DOTs, rather than hammering on Mind Flay, Mind Blast, or Disease Pyroblast like a goober.
There was a time, once, when the first step towards auditing a Shadow Priest's DPS was to see how well they were utilizing SW:P, VT, and DP-- the actual DP, not Disease Pyroblast. I'm not a huge proponent of 'WoW has been dumbed down!' style complaints, but DOTs have definitely been dumbed down and de-emphasized as the be-all, end-all of this spec.
DOTs used to require precise timing to maximize, and now you just mindlessly recast them inside of a huge window thanks to Pandemic. It's kind of terrible.