Compare this to encounters where the primary difficulty is role-specific or even player-specific. Good DPSers pushed their output to the limit on Patchwerk, healers learned to anticipate damage during Malygos' Vortex while one or two people got good at yanking sparks into the raid, and tanks grew experienced with fast pick-ups on Kael'thas. But the average raid group, even when experienced, probably tripped over and over again on encounters like Teron Gorefiend or Anub'arak. When you can't control who gets targeted by Shadow of Death or Anub'arak's spikes and when the randomness limits the experience that any one player can get ... Well, it's easy to see how certain fights acquire the nightmare moniker.
Filed under: Analysis / Opinion