Again, good points.
Over the course of my adult life I've attended numerous courses, college classes, etc. and the instructor is pivotal to the success of the student. All the enthusiasm and desire in the world will not guarentee attaining the desired targets if there is no understanding of the students strengths and weaknesses.
Perhaps I'm thick but I've had tutors trying, almost to the point of frustration, to explain some or other principle to me which I just couldn't grasp - only to have the same principle explained in a matter of minutes by another lecturer that had the experience to tackle it from another angle with simplistic pertinent analogies.
Back to fishing, I like an instructor to be respectful and friendly but critical, very critical infact. I'm a big boy and won't burst into tears if my casting is dissected in a constructive way - that's what I'm paying for - if I want someone to stare at me for an hour and tell me what a pretty boy I am I'll go down the docks! Achieving the level of casting instructor should be prestigeous and applauded but only at this point does the real test begin. Joe public takes on many personas - tall, short, fat, thin, asthmatic, arthritic, nervous, stupid, academic, etc. etc. and all have the right to receive attentive tuition geared toward their particular abilities.
Perhaps it's as important to focus on not being a bad caster that to try to rush into being a good one, either way the mechanics have to be understood and the pupil has to be made aware of exactly what's happening to the rod and line when he is casting.
What was the question again? Right I'm boring myself now so I'll go.
Iain