Super-guild has already cleared Naxx

[Warlock]

I wouldn't. I've done some power leveling in the old world and in Outlands and I couldn't do things that fast.

I don't think I could start from 60, get to 70 and clear Kara, Mags, and Gruul, which is kinda what they did, knowing what I know about the game now, in 48 (or 72 if they got it a day early in Europe) hours.

I guess I'm not as good of a player as you and Mirajj then.

The first level 80 on my server is in my guild and so I heard a bit about how he did it.

Basically he slept three hours in three days while playing a good grinding class.
I don't think he had an out of group healer or a group killing tagged mobs, just an unhealthy schedule and a lot of focus.

Personally I just recently hit 73. I'm taking my time, reading the quests and stopping to smell roses (eg. tradeskills, instances, assisting friends and guildies). Expansions don't come out every week or even every year and I don't want to waste that fresh feel on a mad rush to the end of the game. I see the 'get questhelper you noob' responses to requests for help in general and think 'you've waited two years for something new and now you've installed a mob to help you skip it?'