Originally Posted by
Recke
The problem with saying that they are very different is, each of those three specs are focused on combat and not using magic. I can imagine them all marching into combat. Protection, being the front line, "being the shield of the party." Arms and Fury, both behind the walls of Armor known as Prot, Arms waiting for their time to strike, tactically and with experience, only going in to fight the key targets, Fury "berserking" and furiously slashing at any and all enemies near by. It follows the description you set, but they are all, as Warriors, in the same situation. They march together, they go to war together, they die together. They have no need for things outside of battle, where as a Paladin may enrich himself in the Light, Priests may contemplate the sun or moon, Death Knights question what a Hero Class really is, Mages studying the Arcane for reasons not spec-specific, or Hunters hunting.
Purposefully picking a terrible counter example, Holy and Disc Priests may get along, but Shadow Priests with their upcoming Insanity design and corruption from old gods seem like it would never be accepted in the same 30 feet as other priests, unlike warriors who all go and practice fighting. Protection Warrior still fights to be able to defend others.