I just do Cathedral in 2 pulls, both courtyards then the cathedral. XP per hour looting is not worth it. gold per hour it is. I have made well over 3k gold + an asinine amount of enchanting mats, probably worth another 3-4k plus more silk to craft and DE with then I know what to do with plus all the coin and grays. The coin and grays paid for mounts and training for each group I ran through. It takes me 15 minutes for a full Cathedral including looting everything. About 12 minutes if I skip looting, the extra 3 minutes is worth it.

I can single pull armory on my prot pally. It usually bugs and mobs reset but I have done it 2 or 3 times. Cathedral is faster overall though. Library is the suck. I did get the epic ring though, that was cool. I usually do it once for the quest and to get the dudes the key.

I have pulled Cathedral almost 100 times and have about 8-9 more runs to go then i am NEVER EVER going back there.

I only use my poorly geared prot pally.