looks like u didnt have a good class balance to begin with.. 59 shaman? er.. and def not enough dps or aoe to kill the mobs in that room. Such a bad class balance will frustrate anyone..

Besides that, also seems like the warrior didnt know how to tank multiple targets, resulting in you getting agro from healing and the priests were just messing around..

Basically sounds like a case of bad class balance and bad players.. Try to choose ur groups more carefully imo