Stop getting lazy on your pronoun capitalization. Yes, I am referring to the letter 'i'.
Well 4.5k DPS is respectable for arms, but its not even close to 6.5k pulled by fury currently. So i disagree about the part where arms is a "viable" raid spec currently. Well given how easy content is, maybe, but definitely not if you look for dps.
After patch i believe arms will outperform fury (which was "overnerfed" atm - something that will be eventually overcame with ulduar BiS gear, but for now thats how i see it - 10% was already a bit too far, forcing us to give up another 2% or so damage by dropping weapon mastery is definitely too much imo).
Mace spec will be actually better on trash too, since you will rarely see full sunders on such pulls.