This is great, I've posted the link to my question to my guild site to get the perspectives of our tanks specifically. We have one of each just like you mentioned:a Druid, a Tankadin, and a Warrior that regularly tank for us thus far.
I must say you're totally right about the Tankadin. I think my smoothest run of Shattered Halls was with a tankadin

. great addition to the hordies
Thanks.