Nerfing? The Vault is going to be nerfed, seriously? I'm going to fall asleep in that Dungeon as a Healer even when running it with my SCH and dishing out every DoT I have plus Broil everything ...
Bosses in that Dungeon? Easy as hell, those fights do use repeated Actions ... as example the second Boss uses two Void Attacks, and then sents you back to the edge... inbetween sometimes a AoE Field but nothing more.

Dungeons are easy as hell when you get used to it, I might even say it ... make 'em harder since they're boring the way they're now...