I'm watching the first one now. So far he seems to be fighting against shamans who don't use purge, and DKs who don't interrupt spells. None of them bother to sacrifice their pet Ghoul to heal themselves either. The rogue he fights starts the fight out of stealth. The paladin didn't bother cleansing debuffs.
The only thing you can learn from the first video is that you can win if you fight bad players. Going through the other two now.