PvE:
The Vile Nativity's Argo-Satha should be altered slightly. Yeah, yeah the Vile Nativity is in it's entirety a very easy dungeon (see the video of 3 players doing it) at the moment, barely harder than Flame/Vortex/Palace/KK instead of the relative challenge that Paikang dungeons/unchaineds/Dragonspine dungeons offer. I'm sure many think the dungeon has been nerfed more than enough already.
However, speaking as someone who's pugged Vile 11 times the last week, Argo-Satha is a horrible encounter for inexperienced/average melee players, and is contributing to the favouritism that (hardcore/elitist) people display towards necros and demos over sins, barbs, and especially, hoxes. Not only do necros/demos deal more damage than the melee dps clases in almost all encounters, they also have an easier time in many dungeons, Vile being possibly the best example of this.
Even with tanks following strategy rather than just wailing on the boss (by pulling the adds off the boss so they can be killed elsewhere), it's next to impossible to avoid at least some corpses around boss. While it's relatively easy for one player to avoid dying to it by dancing around the boss, it gets considerably harder with 3-4, or God forbid, 5 melee players. Consequently, most pub hoxes and sins spend most of their time on their back during that encounter, though the fact that the boss randomly shoot people for 3k, sometimes twice or thrice in a row, when rogues and hoxes tend to have 6k hp, doesn't help...
It could be made a lot more melee friendly if the adds that spawn during attack-boss phase spawned from the fires/portals at the edges of the room, rather than randomly beside players. That would make it easier for tanks to control the adds, but still be a challenge since the adds could still target players around the boss at random and run towards them before tanks could react assuming irritate/charge etc was on CD.