Stamina

GET AS MUCH AS YOU CAN

Nothing can replace Stamina it is the most important thing for a Warrior.

You are graded by all others solely on this value. Stamina is the most important thing (yes i said it again). If you are 2-shotted during a fight it is your own fault. Go get some more stamina. 12k Warriors dont get 2-shotted, 9k Warriors get blown away.

Stamina as it relates to Healers.

"Imagine for a moment that you are a healer. Your regular heals are a two and a half second cast; unfortunately, on new encounters, the boss may very well kill your undergeared Main Tank in that period of time. So you set up a healing rotation: you will begin your heal, then another healer will begin a heal, then another -- maybe not so explicitly, but to the the effect that heals are landing every second or less on the Lead Tank.

As a healer, you don't have a crystal ball. You know that not healing your tank could result in a raid wipe. Perhaps halfway through that heal, you notice the tank's healthbar doesn't seem to be dropping -- he has been mitigating damage by good fortune of Defense statistics. However, you still cannot cancel that heal, because the next split second could very well see his lifebar fall drastically!

The 2.5 second heal is the root of the Stamina gearing theory. In almost every new boss encounter, before healers really get a chance to work out what's going on and the ebb and flow of a battle, they are going to be slamming you with heals... Whether you avoid the damage or not has literally no bearing on whether you receive heals or not -- you are still sapping the healers mana bars.

Defense only saves you in single-mob encounters when your life is critically low and you have to rely on the chance of dodges and parries to survive the encounter. The reality is, whether you avoid an attack has no bearing on your healthbar. Had you simply taken the damage and taken a percentage of your lifebar in damage before receiving a 3k heal is no different than parrying the same attack then taking a 3k overheal.

Defense is relying on good fortune in new encounters, where stamina is a steady, reliable base. "

Again from CIDERHELM