I really hate lately how tanks believe they are god because groups cant go on without them. Thats why I que up as DPS now, so if a tank pulls this bs attitude, I just go to my main spec (prot warrior) and do it for them. I may be full icc geared and know what im doing, but the group does what the group wants, if I see people with 200ilvl blues/purples, im going to full clear the instance because they are their for badges to gear up, if I see people in 232+ purples, I know they are there for frost, so I skip bosses. The group make up makes for what the instance should be. Its a game, im having fun doing my job.
We had one tank leave a group cause the hunter (new 80) was doing 1.5k dps in a spec he wasnt used to.
#1 He is learning, no one gets it right overnight unless they played the class before (the hunter leveled BM but just switched to survival)
#2 so what if you leave, your still out 15minutes because you left group right as you entered the dungeon
#3 you screw over the other 3 people as well because of your shitty attitude.
BTW! If your curious, I went tank (still que in the dungeon finder as a dps while waiting for a replacement) we cleared 3 bosses before we got another tank. So you screw us over even more.
That kind of thing happens more then once, and its annoying as hell.
Just a word of advice for good geared tanks out there. If you dont mind waiting, que up only as dps, so if you get a failure tank, you can take over and salvage a group, you will be doing the other players a huge favor