I finally finished my Karazhan key and joined my guild for a Kara run last night.
About the keying processing, I really like Black Morass. It's an inventive and fun instance. It is not, however, an instance that you can really do with a random pick-up group. It's ideal for a group of five friends to just go and practice, to fine-tune their strategy until they are successful. But when you are doing Black Morass in a pickup group, people leave your group after one try, new people join, it's just a big pain.
Anyways, back to Kara. It was good being back in a raid. I've really missed hitting mobs, and was actually very tired of healbotting. I think my Holy spec is a little extreme though, and I'm switching to a Holy/Protection mixture.
I'm seriously considering a Retribution spec, but my warriors love Kings, and I haven't really been able to make a Retribution build that incorporates Kings and enough healing to satisfy me. Given that I'm often the only paladin in a 10-man, having Kings is a necessity. I may go Retribution when we start trying the 25-mans, though.
Karazhan itself is a pretty nice instance, so far. I haven't seen very much of it. We killed Attumen the Huntsmen, and then wiped a lot on Moroes. Good times. The instance itself is an interesting place, less like a dungeon, and more like an actual house (albeit a very big house).