I like my paladin tank because he is the toughest, so often he's the only one left, and then i can rez everyone. Can't rez with a warrior, and DK. I also have played a druid tank from 60-69 (RAF gifted to 60) and I am liking that. Having the self heal, and the big HP boost makes it easy to work my team without a dedicated healer (shadowpriest off heals) Most mob fights I don't bother healing, until the end, and on boss fights, I just apply DoTs in shadowform, then heal when necessary, then reapply dots, etc.

Haven't played a DK seriously, but I think I will run one with my shaman team. And I was considering rolling a warrior, just cause (RAF gift levels again )