KT was down the first day. The others weren't all
that long on Normal.
Here's the score: Blizzard has to make these bosses
possible for the bulk of the players. If it's possible for some completely average sometimes-stands-in-stupid guild, then how can it be that difficult for an entire team of the best? I don't think people appreciate just how much of a skill gap exists in the game, and how much of a difference it can make. No, the game isn't that hard, but it still allows skill to overcome an amazing amount of gear.
IIRC, there was a guild that killed Yogg in all blues in LK. That's perspective for you.
Edit: Oh, an LK wasn't released until people had had some time to farm, anyways.