These gloves are great because of this: "Increases your shield block rating by 15 (1.9%@70)."
When you are getting epic gear as a tank, you likely are already at your max defense of 490. So you don't need more defense. Often you actually need less on certain pieces, because you get so much from others.
Once you have your defense maxed out, you gain more benefit from straight mitigation stats such as block/parry/dodge. (Rather than the smaller benefit to these same stats that you get from defense.)
For paladin tanks especially, these gloves give a very nice benefit to your shield block rating. They also help with greater stamina which is currently a weak spot for pally tanks.
When you are getting epic gear as a tank, you likely are already at your max defense of 490. So you don't need more defense. Often you actually need less on certain pieces, because you get so much from others.
Once you have your defense maxed out, you gain more benefit from straight mitigation stats such as block/parry/dodge. (Rather than the smaller benefit to these same stats that you get from defense.)
For paladin tanks especially, these gloves give a very nice benefit to your shield block rating. They also help with greater stamina which is currently a weak spot for pally tanks.