It scales with Frost presence alright. Several tank builds uses this to gain additional threat. It's just that the server calculates that attack power like every 20th second and not instantaneously.
Originally Posted by nips
I tried a DW tanking spec like Talent Calculator - World of Warcraft but I figured that it gave me a poor threat generation compared to using a two-hander. I use DC for Runic Power dump.
A problem with dual wielding is that you have to get an insane expertise rating to avoid getting parried since you hit much more often than with a two-hander. You also need a good share of hit rating to ensure that you are actually hitting the boss. This was mainly why I generated poor threat.
Suddenly the Dungeon collapses!! - You die...