I agree with Mellvar.
Even tanks who have access ICC 25 are still better off with the Badge Items instead of the Tier.
The base level 251 tier is a downgrade to the badge counter parts, so much so that even with the 4pc bonus it is still a net loss. The only time the Tier becomes a better option is if you have x4 tokens to upgrade 4 items to the level 264. At that point the bonus is worth going for.
Personally I have been passing all the Protector tokens to our DPS, since they have much better bonuses and more DPS is always a good thing.
There is something so appealing about backhanding someone across the face with a shield.