You have to remember you are in a public which automatically makes everyone non-reliable and also you have to realize real life shit comes up.Had a DH in hell act 3 while a group of 3 was clearing the first section just go "hold on a minute" and went afk for 20 mins then came back and said "gotta go, sorry" and then left the game. I whispered him and voiced my displeasure with his actions.
Do people not realize they are making it a pain in the ass for everyone else?
I have had to bail quite a few times during heroic runs on WOW and it made me feel really shit but in the end it's a game, i had to leave one game because my dog needed outside and although that sounds like a shitty excuse my dog/life comes before a video game :-/
rarely do i leave but it happens and i do AFK from time to time but if i know i will be AFK for a long period of time i will just tell them you can either wait 10-20-30 minutes or ill just bounce so you can get on with your game. I can understand the frustration that has on people but people have to realize that lives don't stop when you log in a computer a game.