30% more damage to cold skills.
Adds 5-6% of your DPS as elemental damage as cold. So every time you damage something it is dealing cold damage.
4 Piece Tal Rasha adds 3% more damage to cold skills.
Tal Rasha's necklace can also add 4% of DPS as elemental cold damage.
So thats 33% more damage to cold skills. AND 10% DPS boost as elemental cold damage. And every time you damage something you have a chance to freeze or chill. With any damage source. The reason the first affix (adds %dmg of DPS as cold) isn't on any other item that instantly appears good, is because its an OP affix.
Why do you think Tal Rasha's (except the amulet that is not guaranteed roll) or Triumvirate doesn't have that affix? They are highly sought after and already good.
The problem with Frostburn gauntlets..... Is that people lack critical thinking skills. There is no problem with the gauntlets themselves. I've actually salvaged two pairs already, but thats just because I'm holding out for a perfectly rolled pair. I can see these being crazy big in PVP. Spec Cold Blooded and every single spell you use will have a chance to proc it. GGhttp://us.battle.net/d3/en/item/winter-flurry
Here is another item, albeit REALLY crappy, that will also make all your skills OP with the ability to freeze/chill on hit with any spell. And proc cold blooded.