As much as I hate to say it, Blizzard did one thing right and that was balancing the tank classes so that all of them are equally desirable. A Death Knight is as useful as a Paladin is as useful as a Warrior is as useful as a bear Druid. Some groups might prefer a class over another, but they all can tank endgame equally well.

I think WAR was designed to be a tank spec, but the devs did too good of a job with it and turned it into a "murder everything" job. Instead of specializing, it still can be two roles. PLD on the other hand got shortchanged with only a tanking role, and in current content situation, the only place a PLD can really shine is tanking multiple mobs that are ~50, or kiting a mass of mobs.