settle down children, time to learn a thing or two
all the % stats from passive defense talents are multiplicative, not additive
here's ur table for passive % dmg reduction, all classes and all specs included:
warrior has lowest of them all when it comes to physical dmg reduction. not only that but block is unreliable and, as compensation, druids get more HP while paladins/dks (proper spec dks that is) get
Ardent Defender or
Will of the Necropolis when they fall below 35% hp which is insane boost of additional dmg reduction (it basically makes it so that you have similar hp to bear tanks)
to put it in a simple sentence, the reason why warriors suck and other classes dont as a tank - lowest % passive dmg reduction and lack of pure HP compensation/% dmg reduction talents when below 35% health
the class is playable for sure and u can do end game raids with it but it is never going to be at paladin/dk/druid tier.