I like to think it was already established that Warriors were designed to be OT's long before this game was actually released. Now here we are raiding content, and lo and behold, Warrior is the optimal off tank.

In a game where you can switch classes with the press of one button, I think it makes perfect sense that the MT/OT roles have been set (more or less) in stone for our two tank classes. It just sucks for people who rolled Warrior because they wanted to MT with a few extra doses of MANLY.