It is useless in PvP, but IIRC any knife kill extends GG duration if CoL is active, not just Throwing Knives. Can be sorta not crappy in PvE if you are running Gambler's Dagger and are wearing the Achlyophage Symbiote.
It is strictly a PvE perk, IMO. I swap out to Incendiary Blade or Knife Juggler when I am in the Crucible. Incendiary Blade is probably best to use in PvP because it still counts as a melee kill towards bounties even though it is long range and it also does DoT which can get you Postmortem medals.
Best perks to augment GG, IMO, are Combustion, Gunfighter, and Over the Horizon.
English
-
I can agree with it being more suited for PvE but each of them should be viable choices inside and outside of Crucible. The number of upgrades we have in every sub-class isn't very big. With that in mind, every single one should be a good quality option. A player shouldn't have to look at them and be like, "Oh, this sounds kinda nice. This one sucks. That one [i]really[/i] sucks. Wow, this one's amazing! Now why doesn't that other class get cool stuff like this?"