Defensive Stance

[Artega]

PvP
Advanced Target Dummy: No future in the battlegrounds for Spangles. She has never defeated a paladin, much less a rogue or a mage. Will she have to respec to fury to survive? If there is a defense spec pvp assasin out there Spangles would like to hear about it.
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Protection is viable in mass PvP (e.g., 40-80 people total), where you're basically a drop in the bucket. Your primary job will be to be a mana sponge and to protect your priests and druids from rogues. Improved Shield Bash will instantly shut down any kind of caster, and the five-second stun from Concussion Blow cannot be overstated.

If you expect to be doing LOTS of mass PvP (I wouldn't consider Battlegrounds to be mass PvP; although 80 people is feasible, you won't be seeing the entire opposing raid group for most of the match), then maybe you can stay Protection. If you aren't, you'll want to be a Fury or Arms build, since you'll be making up a significant portion of your group's DPS.

I'd strongly suggest you tweak your build if you want to be at all serious about PvP; Tactical Mastery is downright required for efficient PvP play. Bloodrage cuts your HP (even the small cut with Improved Bloodrage is too much), and has a one-minute cooldown, which effectively makes your Intercept cooldown go from 30 seconds to 60 seconds.

Even if you aren't into PvP, I'd find a way to work at least Deflection into your gameplan; the extra Parry will go a long way in increasing your tanking potential.

I'd also recommend dropping the points in Battle Shout and giving them to Unbridled Wrath. While Battle Shout will make Shaman, Paladins, and Rogues love you, the difference in DPS is fairly negligible, and the two extra points in UW will go a long way in increasing the amount of Rage you generate while tanking, especially if you use a fast weapon. Alternately, take that point from UW and give it to Battle Shout; 8% isn't really significant :)

It seems you have the issue of losing rage to stance-switching covered with your macros, but you might want to give Tactical Mastery (and Anger Management, if you can find the points for it) a shot. It'll make you less reliant on Bloodrage :)

Then again, I find myself switching to Berserker Stance to do an Intercept or two-handed Whirlwind pretty frequently while tanking. YMMV.

Finally, I'd like to know what you think of Shield Discipline. I had it a while back, but didn't really find it particularly useful or interesting. I ended up using the six points invested into it (maxed 1h spec and Shield Discipline) into Tactical Mastery and Anger Management. Of course, I later spec'd out of Protection entirely and went with my 34/17 Fury/Arms build that I currently use, and I've been happy ever since :)