Reposting from here http://forums.worldofwarcraft.com/thread.html?topicId=10971908989&sid=2000
First of all I completely agree that Mages needed a leg up against Warlocks. Master Demonologist: Felhunter, and just the Felhunter in general has given you guys quite the rough time against us. You needed some love and you got it.
That being said I can't help but just stare at the screen with a blank look on my face as one class-wide, undispellable ability essentially invalidates most of my entire talent tree, Affliction, by simply causing our DoTs to not be worth casting at all. UA isn't even worth casting- it ticks only twice (down from 5). Corruption ticks 3 times. Haunt lasts a mere 6 seconds...maybe boosting the damage of 2 ticks. Drain Life ticks only twice (down from 5) Immolate ticks only twice. Fear lasts half duration (I don't have a problem here, really, that's more than fair) Siphon Life is really the only one worth using. Shadowpriests, likewise see the same effect. The only thing is this doesn't have nearly the impact on other classes/specs.
I guess what I'm trying to say is it essentially removes the whole "DoTer/debuffer" playstyle when we're in the arena or battleground against a Mage. Please don't misconstrue my complaint as losing to a Mage- I get steamrolled over by Rogues, Warriors, Ret Paladins, Deathknights all the time- but that doesn't bother me even a fraction as much as fighting a Mage and not even being able to use the abilities that define my character, essentially turning into a Destrolock with zero points in Destruction who has zero interest in playing a nuker. I've stuck with Affliction through thick and thin, even raiding BT/Sunwell with it when Destruction is clearly god mode and Affliction even wimpier than Mages =P
Anyway, just putting in my $0.02 in hopes that this ability will be reworked to still bring Mages out of their funk, but without acting as a complete playstyle killer to Affliction and Shadow.