1.- You're a liar
2.- You didn't play Cata's HC dungeons AT THE BEGINNING before the massive nerf. I did. And it was p-a-i-n-f-u-l.
Why it was painful?: because we pass from the AOE grindfest of WOTLK dungeons to 'things' like 'Crowd Control', 'Stuns', 'Polymorph', 'Saps', etc, etc. 'Things' that nearly 90% of the friggin' players had forgotten.