I often hear alot of people praising the difficulty of TBC heroics. Bragging about how much easier things have been since then. I've always been curious just how hard these dungeons were. Was the difficulty entirely skill based? I found this old video from Preach while watching some of his old stuff. He's saying how he was challenged by TBC heroics but found the launch week Cata heroics to be trivial in comparison. Is this true? Were pre-nerf cata heroics really that much easier than TBC heroics? Has there ever been a difficulty in the game besides mythic raiding as hard as a TBC heroic?
Also, TBC raids took months to be fully cleared by a single guild. Why was it that Lady Vash took so much longer than Mythic Kil'jaedin to clear? Was he really that much easier than her? I assume she was so bugged that it was impossible.