I had the honor of accompaning 9 of my guildmates into Karazhan last night.
3 Hours. 5 Bosses.
Everyone is getting to the point where they know the pulls, they know what to do, and they do it.
Our group last night was
Me (Prot Paladin)
Zadorr (Feral Druid)
Wichita (Elemental Shaman)
Lakini (Balance/Resto Druid)
Baconstrip (Resto Druid)
Sylvara (Multilate Rogue)
Schmedlap and Nemesis (Marksman Hunter, Winterspring Cat)
Calexis (Holy/Disc Priest)
Rhubarb (Holy Paladin)
Condramous (Fire/Arcane Mage)
Everyone did an outstanding job. We did not have a single wipe. Dare I say it was "easy"?
Schmedlap joined the Teir 4 club. In fact, Curator dropped the EXACT same loot as our first kill.
We had quite 3 trash epics drop: Boots of Elusion, the Feral Boots, and a Nature Damage ring. Great, I thought I had problems holding threat off Wichita before. Actually, Wichita is a really good player who manages his aggro extremly well, while at the same time doing incredible DPS. I had him at 900+ dps for most of the night. That is simply incredible.
I've started using WoW Web Stats to get information on the runs. When you start the run, you type /combatlog. This saves your combat log to a text file. Then I upload the file to WoW Web Stats and they parse it out. I can see how the DPS is doing, how many Crushing Blows I'm taking and where my threat is coming from.
One thing I noticed from using it, is that I'm missing very often. My miss rate is around 20-25%. That's a good chunk of aggro I'm not getting. Protection Paladins have a talent called Precision which increases our chance to hit by 3%. I had ignored the talent before. It was passive, so you never actually saw it working, but now with WoW Web Stats, I could spec into and see if there is a difference.
The problem is where to find those 3 points. I've tried to spec for PVE and PVP, and with a bloated Prot tree, I'm spread pretty thin.
One option I have is respecing throughout the week. Spec Holy for Arenas, Prot for Raids. The only problem being that this could get expensive. It's 50g for each respec, plus the cost of the Talent spells like Avenger's Shield, Blessing of Sanctuary, Blessing of Kings, Holy Shock, and Divine Favor.
Also it would mean completely redoing my UI and keybindings.
I know Warriors face this same delimina (Arms for PVP, Prot for PVE), and I know some Warriors spec back and forth on a weekly basis.