Nerf corruption 25%, give 10% to dots back a patch later....we still are only about where we started a patch ago. Also the bunk of "aff scales" doesn't apply here. Look at how shadow, boomkin, or especially unholy are "scaling" in comparison. Unholy will apply and spread dots that tick 7x to 10x as hard instantly without the constraint of soulshards.
Yeah it really blows that a purely dot based spec has less dot power than say an unholy dk outside of cds.
I think the problem is more that AFF has shifted from being a pure dot class to being a Dot Manipulating class. It takes channeling Mal Grasp to get the full potential of your dot pressure which presents two problems:
1.) Your spread pressure is quite low since you cannot be channeling Mal Grasp on more than person.
2.) This is PvP, as a melee class....I have absolutely zero intention of letting any caster just sit back and free channel.
In expansions of the past AFF was amazing because their "filler(Mal Grasp)" wasn't required to do the vast majority of their dps. This made it more difficult to spell lock them, and less detrimental when they were locked. They no longer have that advantage.
I also wish people would stop comparing Unholy Dots to Spriests and Aff Locks. We have one incredibly strong DoT and one that is on par with the afore classes in damage per tick. However, please remember that Unholy Diseases are not affected by haste and only 1 disease per dps spec is affected by their mastery. We have one DoT that ticks harder, but your dots tick significantly faster and can even have extra ticks added.
Back on topic, AFF is no longer a pure DoT class. I'm not sure what to do about it for pvp, as Blizz is happy with it working this way for PvE (or so they've stated). I'm not sure they care if AFF is pvp viable, I'm pretty sure they're pretty happy if they can get just one Lock spec to be really competitive. Right now, that spec is looking like Destro. I don't like it either, I enjoy AFF a lot more than Destro. If I wanted to be a burst caster, I would have rolled a mage.