Its interesting to see what a mentor should do in the opinion of some people. We are here to help out new players, those that are starting the game and need help. We are not here to carry all new bonus people to the end of the instance. If someone is lvl 60 I dont see them as new. I will give an explanation about the boss mechanics but I will not go there and look if the players does something wrong with their rotation. I also carried players through dungeons that had no dps checks with them only using one attack as a monk...(I cried and facepalmed a lot inside of me). But not everyone will be so patient. And it was already said by the GM that a difference in play style is a legitimate reason to kick someone.
Sohr Khai does have some soft enrages at the bosses. If the other DD was also only okayish in their dps than this might mean that they wont even defeat the final boss. Well and if one of the others see that the OP does not even wear gear that are good for their job, well its kinda their own fault too. The dungeons are not limited, using maybe one or two weeks to gear up before going into it again would not mean that they will lose the chance to finish it.
@Altena: I am mostly a person that tries to give people a chance too. But the endboss of the vault is a healer check. If the others in your party managed to avoid a lot of attacks and you still wiped because the healer did not heal fast enough than this shows that they are not ready yet. Giving them three chances to finish him is already quite patient these days..sadly there are often people that want to vote kick someone after only one wipe. But if he/she is not good enough to heal through it than its sadly the best to kick them. There are the other people in the party that wants to finish the dungeon. Keeping someone in the group even though that person is the reason for the wipe and it will not get better is kinda a waste of time for all the others. I mean if this is a dps check and one person in the group is holding everyone back because they want to play ice mage and thus they wont have enough dps to finish the boss it would be kinda bad for the rest if you let that person still stick with you because in that situation you will not finish the dungeon and thus you wasted all the time which could have been easily saved by kicking the person. (And really the person will also not get better because they will be carried through the content..if they are kicked often enough maybe they will start to finally learn how to at least play their job)
If the rest of the party is good enough to cover the slack of someone else than they might be able to finish the dungeon. But in the end that person still got carried through content thanks to the rest working harder. And about your sentence with going with friends. Well the same can be said in reverse too. If you dont want to put in some work, are barely past the ilvl or are just not good with the game, you can just queue with your friends. And in content that has a harsh dps check and cant be cleared thanks to some hitting only auto attack..well low dps is a reason to kick.