I've been playing my shadow priest at level 70 for a few months now. I've got the frozen shadoweave shoulders and boots (almost finished gathering mats for the robe), and the rest are blues. I've heard that shadow priests can be huge damage dealers...but I wasn't seeing it on my priest. I was always way below the other dpsers in damage output and couldn't figure out why. Then a warrior I befriended who had a spriest gave me this advice: Use PW:Shield and then SW:Death whenever they are available. (and make sure SW:Pain is always up on the target)
I went to Netherstorm to practice on the mobs there (might as well gather rep stuff while I'm practicing *grin*). After working with my spell rotation, I found that my dps has improved a bunch....at least 100 per second, and more if I got more crits. And the damage I recieve from SW:Death isn't really huge either.
I hadn't used SW:Death much before, because I didn't want damage to myself if it wasn't a killing blow...thus, I had always used it only as a killing blow.
My spell rotation used to be PW:S, VT, SW:P, MB, MF until MB came up or the mob was around 1000hp left, and then I would use SW:D. Now, I use MB, SW:P, SW:D, MF or VT, and use MB or SW:D whenever they come up (also renewing SW:P). I'd shield and/or VE if the mobs hit hard. However, I still start off with VT and SW:P when in a group because I don't want to crit MB right off and steal aggro from the tank.
Anyways, that long block of text just to say that working with different spell rotations really does make a difference...and so does SW:Death. :)
*Edited for typo's
Edited, Jul 18th 2008 2:12pm by Similyn