Protection Warrior in Wrath - Viable?

[Ken]

The reasons everyone was so gung ho for Warrior tanks was because they couldn't effectively AoE tank. With the changes to thunderclap scaling with AP, and being able to hit unlimited targets Warriors are now viable AoE tanks. It is really going to come down to your personal preference IMO. Buff wise, warriors don't bring much to the group. Pallies have blessings and Druids have Gift of the Wild / Thorns.

http://www.wowwiki.com/Commanding_Shout is helpful :)
So are the stun abilities and Intimidating shout (fear for 8s). Let's not forget charge, intervene(make them autoselect depending on friendly/enemy target in a macro), etc.

It's all just a matter of preference indeed :)