It's been said multiple times here but people seem to not quite read it:
The set bonus is situational.
Sindragosa? Won't help that much against the magic damage.
Blood Queen MT? Hell yeah! Save the healers some tank damage is always nice. Blood Queen OT? Can't dodge that damage, better get offsets.
Saurfang? You bet! Even if you're not saving the marked damage you're still reducing incoming damage, always a plus.
Festergut 3stacks? Yes please! Lady Deathwhisper? Ehh, not so much.
Given a couple months we'll all have the frost emblems we could ever want, leaving us to snag all the offsets and tier pieces. Swap gear as needed; every fight isn't Patchwerk.