I've been MTing Karazhan just fine - I lost about 2k armor and 1.5k hitpoints, but it really hasn't affected boss fights noticably. The change to Lacerate makes me a very happy tank, as that's a pretty good bump to threat.
We had a few issues this week and so my group hadn't gotten back to the prince, but I don't imagine that it would have been an issue there either - or at least one not fixably by flasks/consumables.
Since the druid "nerf", does anyone else take a protection pally as an MT/OT? Most of these posts are before the patch changed a few things for druids, so I was trying to get a better idea of what to start looking for as far as getting kara groups at 70.
It looks like squisha's group setup would work best since the patch.
The druid nerf didn't hurt that much at all in Kara. Only time I truly notice the extra damage is on Maulgar.
Threatwise, it's only things like the non elite packs before Moroes/Opera that are harder to AoE tank, all of the single target, or even dual target stuff is no problem. (for reference, I run flaskless in Kara, only the occasional agi/defense pot + food/rum as standard)
That being said, we do have a prot pally as OT for some of our groups. Basically it's been
Feral MT for one group and Prot Warrior MT for the other.
OTs have included Prot Pally, 2*Arms/Prot warrior, lesser geared ferals.
The pally has help up his end fine, but does seem to be more susceptible to being bursted down than when I've had the warrior OT, this seems to be a gearing difference more than anything else however.