Warrior tank , not much to discuss. It is the worst tank overall right now.

No self healing, no abosrb shield. Warrior tank in our raid drains healers mana like crazy. It also walks slow (walk speed very important in a lot of encounters).

Warriors have a couple things that make them unique. If the encounter doesn't require them, warrior becomes the worst.

Disarm , Shield Reflect, Charge, Shockwave stun.

Currently, none of those are truly required for any encounter. So no warriors.