I have a DK tank that's lvl 80, but I haven't swapped him in yet. I'll update this when i try him out.

I do enjoy shockwave for the warrior, it's pretty awesome.

My main motivation for swapping in the druid was the additional healing that improved leader of the pack provided and the crit bonus. I tend to make my teams so they get as many buffs as they can.

There are some benefits of the DK tank that I can see, such as deathstrike, life tap, ghoul sac etc for extra health.

Multibocks: I agree that the difference between a good and great warrior is very easily noticable.

Paladins definitely have a lot of utilty too with divine protection and divine sacrifice plus some wipe protection. Blessing of salvation is a good decrease in damage and scales really well compared to others.