I'm not sure what you consider padding while linking Blast Furnace. There really isn't a whole lot of padding in Blackrock Foundry at all, truth be told. Almost all damage is effective.
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Viable, yes, but the rotation is tricker and it really isn't much of a gain. You are gaining slight damage but losing out on Enrage procs (and rage to go with it), S&B resets and US stacks. It takes very good timing to use it optimally.
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Most Arms/Fury Warriors don't use Ravager anymore either, again I'm confused as to what exactly yall consider padding. AoE =! Pad.