This instance was bugged at launch, but the issues have been fixed. The gooblins in the last room were doing heroic damage. They are still very damaging if your resolve is still low (below 175?). Best not to pull more than one group at a time.
At one point, there are two rooms full of skeletal iksar that repop nearly instantly. Clearing the first room a bit will allow you to pull the named that wanders into the empty hallway behind you, thus avoiding the instant-repopping iksars.