I couldn't agree more with the comments from other tanks. I too was a raid tank in Wrath and retired my paladin (arguably the easiest Cata tank class), not because its too hard, or challenging, or even because its not fun. I retired because of the horrible attitude of players in the LFD. I will only tank for guild runs now as well. I second all of the previous posters frustrations. The simple matter is we are all learning mechanics, and a tank miss on a mechanic means everyone wipes. DPS miss on a mechanic means little, sometimes they die, generally not a wipe. I feel for healers as they get a lot of the same problem. Not much call for my Holy/Prot paladin.

The game mechanics have changed to the point good solid players generally are not willing to sacrifice and hour or two to deal with the garbage and run guild runs only. Sure there are exceptions but the good players are done with LFD and what is left are mostly irritable soloists who have nothing better to do than make snide remarks and ruin your game play time. You just simply get so much more rewards and gratification doing a guild run. Fixing this isnt as easy as a grab bag.

Team work, patience and good character come from your guild or friends list, not from the anonymous random dungeon finder. It worked in wrath because the above 3 traits were not needed to accomplish the task. It simply does not work well now.