a guildie of mine tested it out just for the heck of it. doesn't work.
probably one thing to note is that if you cannot get yourself attuned to karazhan through the keying instances, you're not ready for it.
oftentimes, guildies think that they are uber-ready by virtue of being lvl70. but if that guildie is still running around in greens from nagrand, i'd tell him to go and get geared up first from shadowmoon or netherstorm quests as those are already blues. also, some of the lower level instances until they can take 2K-3K damage. yes, even clothies.
if your guildies are having problems, it could also just be their play style. ask them to go PUG. pugs will tell you whether you're playing a class right.
i've met folks who got to lvl 70 with missing rings and trinklets, mixing up gear, messy shortcut bar, and still manage to get through shadow labs.

trying to unprogramme their mind is now the toughest bit.
probably another thing to note is that sometimes, the instances doesn't behave the way it normally would back in azeroth. so be prepared for unusual moves that will happen, especially during weekends. seems to be happening more then.
This post has been edited by myremi: Apr 9 2007, 08:41 AM