It should not be an option in the regular spec or class tree. It’s garbage talent that sucks to use. A lot of Aff players do not want burst options, they want sustained damage options. Even in PvP you would favor sustained damage over burst as Aff plays best in either 3v3s or RBGs, 2v2s it’s bad because it’s not meant to be the star to get the kill, only to help get the kills with the rot style.
It can be in the PvP talents tree, it should not be in the PvE/spec tree, though.
Also for PvP you are not actually gutted, at all. You have things like Creeping Death to help give much better sustained damage pressure since it no longer shortens DoT durations now. You have things like the improved Haunt to get more DoT damage out on all targets which increases your sustained pressure.
Throw in Rapid Contagion, along with Creeping Death and you can, from the looks of it, get up to 40-50% faster tick speeds.
Throw in Grim Reach, if we can reach all of this, along with Grimiore of Sacrifice, and you can watch Darkglare hit all targets with DoTs on them, 1 for 100% damage the others for 50% damage, even probably through walls (maybe).
Throw in GoSac procs proccing all the time from DoT ticks, from DG ticks and you’ve got a good burst plus sustained rot pressure going, especially if you have ID where you’re also building your stacks of 50 Drain Life for that spam.