I have 4 shamans, and I swap between my warrior and my paladin for tanking.

The warrior seems to take less damage, hold better single target aggro.

The paladin benefits from ALL of my totem buffs, holds better aoe aggro.

I just finished ZF with 1 pally 4 shaman, and I've also got some videos up of SM/RFK. I have clips I have to put together for an old RFD run, and my ZF run. I accidentally leveled out of the Ulda range after 2.3 hit. :P

http://youtube.com/profile?user=hyshnari