I'm sorry to hear I'm not the only one that has had unpleasant dungeon experiences. When I was tanking a dungeon the other night (lvl 21 Marauder), no one said a damn thing to me the whole time but right after we beat the dungeon, both DPSs were like "worst tank ever" and "wish you could uncommendate someone for sucking" and then immediately exited. I had said I was new to MMOs so I don't know why they expected me to be some perfect tanking machine grrrr.. I switched to a different server and made a new character because I was so upset.

Hope you have better experiences in the future.