I would agree that many tanks think they are the King of the group....and since there is a shortage, people just deal with them cause getting a tank is just hard. It is sad that that is reality of the LFD group there.
Overall it is sad there are not many in the LFD that want to try and work as a group, and realize some may be learning heroic, getting gear (but did do normals...just need heroic now), and/or that you just have to have patience (there is alot of new atm).
I have been tanking for my guild and enjoying the heroics.....I jumped into the LFD a few times and have really had only one full random go ok. I try to explain before I pull and such...unless someone else steps up before me (which is fine...I would rather just tank :)
Overall I think you gave a very good idea of what the LFD is like right now (and was really) :) The same people are there from LK....it is just that is was soo easy no one talked and just kept moving. Now you have to deal with the fact that the group is ....well...not working as one at all. I can remeber tons of heroics I did in LK where not one word was said....I almost always start the dungeon with, hello....and sadly not many would reply.
I currently view the LFD as a fill in the ONE or TWO missing spots (most of the time DPS). I have filled the healer spot with LFD (not much though since we have some in the guild) and normally it works out fine even if they are new...cause the rest of us have run alot and do our parts pretty well as a team....the healer catches on rather well and we finish the place. Some are worse then others....but I would say I have not kicked any healer we get even if they are not that good. We have kicked some DPS....but that is because they would not stop talking crap....and were very childish.
Overall I really hate kicking people cause I know what the queues are like...and I feel bad even if they are bad.