Yes the final raid boss has a huge crit spot he is in a corner with a shield and sounded by a zillion adds. That explains the nerfs.
Watch. Bungie nerfs all this gear prior to the next part of the AP to prevent raid stomping, earning all this EXTRA hate on top of all the other playerbase raging going on. Two days in to Opulence, someone discovers a cheese and makes the raid a walk in the park anyway. It wouldn't be the first time Bungie tried to preemptively "correct" something only for players to find new ways to break it anyway.
you just described pretty much every boss in d2, hence the reason whisper seems so dominant.