However, in terms of absolute time to live with respect to melee attacks,
armor has no diminishing return effect. Given a constant melee DPS amount,
each additional point of armor (whether it be from 0 to 1 or from 30000 to 30001) will increase the tank's time to live by the same effective amount. 1k additional armor increases time to live by approximately 9.47% (6.01% at level 80??), as shown by the graph. The formula for calculating time to live with respect to melee attacks is:
Effective time to live = 1 / (1 - DR%) * Base time to live
Where DR% is calculated according to the above formula. In this way, armor can be thought of as increasing the effective health of the tank with respect to melee attacks. Since DR caps at 75%, effective time to live caps at 400% of the tanks base time to live (time to live if the tank had no armor).
Prior to hitting the cap, armor is certainly a very desirable stat for tanks, but difficult to find. Most items of similar quality and rarity have similar armor values, and extra armor can be found only very rarely.
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