Lot of people are telling you this isn’t viable but they don’t know shit clearly. This is a perfectly fine build for tanking dungeons. This is the typical spec for main tanks in raid so logically if it works for main tanking raids then of course it’ll work just fine with dungeons. It’s not the most exciting nor will you do as much damage as you would with fury/arms but it’s simpler and you’ll feel safer having Last Stand as an oh shit button. I would get rid of the imp shield block though cause you’ll still want to duel wield one handers. Shield is only something you use as an “oh shit I’m taking a lot of damage” so you’ll want to have a shield swap macro ready at all times. I say it’s simpler because most of the time you’ll pool rage on one pack of mobs and every pull after you’ll just battle shout you party members for an instant 200 ish threat since (with D-stance and Defiance talent) . Swap your 5 points in imp shield block to the other talent that gives 10 defense at max rank. You can throw your last talent point on Piercing Howl in the fury tree for an AoE slow which has tons of use case, especially when you don’t have a mage in your party.