ALL Training schools have politics and busy schools will have even more. Its just the dynamics of people and stressful situations. The fact is that the students begin to realise that they have spent alot of money and that the job market is not easy once finished.....it becomes easy to blame the school or instructor. And yes you will allways find some students who get on better with one instructor rather than another and some instructors are just better than others full stop.
The reputation and quality of instruction in NZ is up there with anywhere else in the world and all the well known training schools in NZ produce a quality product.