Just saw this post and registered to respond. The whole "Bad" thing needs to be separated from some players. There are players that do try very much but some circumstances don't allow them to be topping the charts or tanking hm raids.
Bad should be saved for the players that just don't care. I have had multiple days were my health issues make me not exactly in top form and been raged at for not being super fast, or topping the charts. Does not mean i am not trying, Just means i would still like to play wow as it's something i enjoy on those rough periods. I can still tank and heal a heroic just fine, Just might not be as fast as most like.
I have a friend who has issues as well, as soon as you tell him the fight, He'll do it like a pro and exactly as told, but he's not able to be on vent and such so has been raged at. Problem is he's deaf and we still have not figured out how to get vent to work for him :P
People in wow need to be a bit less fast to call someone bad. The dungeon gets done, and people are trying, i figure we're good to go. Some of us love WoW and other video games, But being called bad when your trying and perhaps under geared or something, Just isn't fun. Now the tank i healed with all agi gems as a warrior last night, Feel free to call him bad :P