People killed afkers in the air not because of frustration but more for free honor points and hks, if you flew high enough most people never noticed you or cared. Taken from somebody who played the majority of WTLK. Flying was definitely a must and many people enjoyed it, the only bullshit about flying involved not even flying as much as NE Druids being able to shadowmeld flight form away from fights but thats a mix of racial problems not flights issue, kinda like how some people complained about bubble hearthing.