No, I still don't.but you don't think it should increase DPS. Given that a shadow priest's PvE role is DPS, I would like this explained.
A 51 point talent should not be alpha and omega for playstyle. Just look at Vampiric Touch , it's been nessary for the entire TBC but also been the single reason our dps could not upscale because it would regen to much mana.
Regenerating 18000 mana on a 6min Brutallus kill is insane. Imagine if the value was even higher.
Personally I think with DoTs being able to crit (that includes Mind Flay) , Blizzard can easier create items to upscale our raid dps. It's to early to talk about how good our dps is, as I wouldn't call the current beta realm for fair testing.
The current state is acceptable for WotLK launch, and then we'll see some upcomming balance changes in the next couple of months.