I had exactly that experience last night on my 26 glad. I didn't even get to tank and thm pulled and archer lit it up.. I told them to let me pull they said just do it they can cc mobs, They certainly sounded like they knew what they were doing.

The THM pulled again I flashed grabbed the doctore and instead of focusing on him they decided to burn the adds that came with him down by themselves.
It didn't work, the archer died the thm was pissed and said I couldn't hold aggro on a mob I never saw. I killed the doctore and the adds with the good conj and I left the instance. 15 minutes is Nothing compaired to 60 with people like that. You're right about Wow behavior though, I was a 90 ne priest, I healed them all listened to the rants, these guys will get tired and leave soon.