Tony,
Thats a fair point. I have had variuous instructors, some career instructors and some 'hour-building' towards an airline job, and all have been excellent at their job.
I realise that some instructors may not be as good as others but surely that is the same in any profession?
I don't think it is as simple as saying that all instructors should have 1000 hours+ before becoming an instructor. Hours are just a number.
Its what you do with your flying that makes a difference.