actually, I can still remember cata heroics near launch...
pre-xpac people said wotlk was too easy and asked for a challenge...well...they got more than they bargained for. cata heroics (before mythics were introduced) were overtuned which led to a large runt/cry, which in turn led to a massive nerf across the board to all dungeons.
cata heroics at launch were HARD, but once they got nerfed it was a bigger faceroll than wotlk.