This is a long post... so if you don't care about my story you don't have to read. =P
So I'm looking at the daily heroic a couple days ago and it's slave pens. It had been a while since I stepped into heroic SP, much of my gear has upgraded since then and I was curious and anxious to see how I would do now. I see someone posting in LFG chat and I join up. There's 4 people in the party, and long story short we get another dpser and our party configuration is Elemental Shaman, Rogue, Warlock, Holy Paladin, and Prot Paladin (Me).
It takes about 45 minutes for everyone to get ready to go, people forgetting to grab the daily and doing other stuff. I was fine with that, I can be patient. Finally the healer comes, and I check out his gear. He has +800 healing, +0 spell crit, and +80mp5 w/BoW up. I already know this is going to turn out bad, but I didn't want to just bail on them, I don't like to bail, I just consider it a challenge.
Anyway, we get into the instance and buff up. Then the Paladin says "Oh ****, hold on guys, I need to get something and I'll come back by myself." I'm thinking ok.... I hope he doesn't take too long. Someone who is in his guild says his baby is crying. I don't know if he's kidding or not, but I'm waiting and waiting and waiting... finally I check the map and he's moving to Cenarian Refuge. I ask repeatedly what he's doing and why he had to leave (I think he didn't have the key) no one answered me, two of the others were in his guild and one just kept saying "haha" when I asked.
I was already pissed by this point, I can be patient but this is turning rediculous. Finally the Paladin comes back and the rogue wants to mark and sap and everything. Normally I would just aoe tank the first pulls, but considering the healer's crappy gear I decide to just let them have their cc.
So he saps and I run up to body pull the mobs. I do my judgement on the skulled mob (wisdom) and the rogue immediately starts going crazy on him, stunlocking and wailing on the mob. So's the Elemental Shaman. As soon as the mob knocks out of stun he one-shots the rogue. I taunt him onto me and the warlock just starts fearing them randomly. The other one breaks the sap and runs at the healer. Among all the confusion I didn't notice and he died. The elemental shaman starts healing me and the warlock keeps fearing mobs, even though im more than capable of taking their hits until they died. I then ask the rogue to not use his stunning moves at the beginning of the fight. To which he is not privy to and pretty much doesnt listen to me.
We heal up, I just start aoe-tanking the mobs thinking F--it. We take the next couple of pulls pretty easily. Then on the next pull almost the same thing happens as the first pull, this time I managed to taunt the mob back onto me before he killed the rogue and I aoe them down, or at least try to because the warlock just keeps fearing them, even though I'm nowhere close to dieing, even with the healer being in the crappy gear that he was.
We finally get to a pull of 3 naga, I just toss my shield at them and start aoeing them down like normal, then the warlock runs up and AOE fears all of them, one of them going into another group. As soon as I see that other group aggro, I bubble, hearth, call the warlock an idiot, and drop group.
I start getting whispers from the warlock saying I'm the idiot and I should learn how to tank. When I mention he was the idiot for fearing the mobs he stopped replying. Then the Rogue comes up saying I was a horrible Paladin tank and should learn how to tank and he has never had a problem with other Paladin tanks, etc.. etc... I explain to him how our threat works and his stunlocking was ******** me over. He said he was trying to stunlock in my consecrate radius but he kept missing it, which I believed, the second mob he did that to was right outside the radius. Anyway, I ended up convincing him I'm an awesome tank, that miscommunication was probably the source of our problems, and he added me to his friends list and invited me to OT kara later.
That was the second time I bubble+hearthed out of a group due to frustration. I'm usually pretty easy-going as most of you know, but that was just the straw that broke the Camel's back.