That's 1 boss, try looking up.... pretty much every raid boss released in original Cata, or every raid boss in Icecrown Citadel, or Ulduar, Zul'gurub, Zul'aman....
I hate to think how bad my old guild is doing on that firelands boss though, they couldn't even make it passed the dragon twins in that shadow temple thing in cata (forgot what it was called, kinda happy that i can't remember too

).
Besides, the Ifrit video doesn't show everything, it shows clips, there's no real telling exactly what he can do till we finally get to fight him. I'm pretty sure S.E wouldn't show the entire boss fight tactics in a preview video, and I seriously doubt the fight is going to be as simple as some people seem to think.