I refrained from saying anything adverse through the dungeon run until we arrived at Beauty at which point they wiped us over four times. I made a comment to the healer, who had asked them what they were trying to do, that either the whole guild was worthless or these three were the idiots of the bunch. Not the best choice of words, but after some 17 to 20 wipes I was a bit annoyed so please forgive me.
The two DeathKnights were allowing their ghouls to pull groups because they didn't dismiss them before following the tank over the two ledges that most groups hop down. I put these occurrences off at first as mistakes. After the fourth time, already having been reminded to dismiss pets after the second occurrence, they were no longer mistakes.
The Warrior decided to improperly tank the third boss and kept him in the fire nearly constantly causing over eight wipes alone. After this boss the healer asked me to use CC on the next few pulls. The Warrior and DeathKnights purposely broke the fear CC on the first group and ran ahead pulling the next two groups before they could be CC'd.
At Beauty, one pup was marked to be killed and the other to be feared. Each attempt at the boss the DeathKnights put DoTs on the feared pup. The one I was able to notice before the mobs reset was Ebon Plague.
We attempted to ask these three members of your guild what they were trying to do and were largely ignored. I asked them if we could be serious about the dungeon after the second wipe on the third boss and was told that they were being serious. We received no more answers from them after that. I can only assume they were wiping on purpose.
If they found it fun to do so the healer and I did not. The toon I was playing was a Warlock belonging to my friend who I am getting the last pieces of gear for to make it raid ready. This dungeon wasted quite a bit of time and got me nowhere.
The three toons with questionable behavior, at least by many players' standards, are Saranghae, Darthas, and Kiririn. I see that they are rank seven in your guild and I don't know if they are knew to their roles or these dungeons, but lack of an explanation on their part as to their behavior has left at least two people with a bad impression of your guild.