Prot: You suck. End of the line. I MT in the most cases, and as Sathoris wrote, we got a pretty high mitigation, like the 15% dmg reduc and 6% spell reduc, plus our normal armor, and mine is atm taking 60% dmg, alas i cut off alot of dmg alone on that.
We got a lesser shield wall, yes, but its on half the CD, alas 50% + 50% counter the 60%. Which would you prefer?
And using block... HAH! Never have i read such babble! Uncrush was removed 3.0.2, so no need to use the 102%-rule, just stack ahoy on the dodge and parry! After all, we got 2x block-chance raisers, each on 30%, and since we don't block that many attacks from a single boss, i think that is ftw. Though empowering the blocks never hurts.
One last thing; If the protadin is played correctly, it's a powerhouse to everything! I out-run the warr-MT in one of my last guilds, and he was geared far better than me.