I totally agree and this was my point of view before I had kids. I went to the worst public school SA has to offer and was the only person that ended up with a PhD from that school
When Ange and I began interviewing schools for our kids, we looked at schools in the area and didn't care whether they were private or public we just wanted a school with a good academic curriculum, a focus on higher education and NO LABELLING OF KIDS.
We chose a private school not because it was private but because it just best suited what we were looking for. Performance is based on the childs past capabilities and not compared to other kids. My son is a wiz at mathematics and accademic performance but can't connect a ball with a bat if his life depended on it! He tells us he hates sports and that's OK, so do I and I remember being forced to play cricket and hated it so much that I can't even stand looking at the game now. The school that he goes to does not force him to become "better" at things that he has no intrest in and is not good at. They focus on the accademic side of things and develop that even more because he is good at it.
One of the schools we looked at (a public one) had an accelerated learning program for gifted children and another special program for children who had been labelled as having learning difficulties. There was a young boy screaming in the corridoors while we were there and the other children were told that his behaviour is excusable becuase he has ADHD! We couldn't wait to get out of that meeting and obviously decided against that school due to the lablelling.
Another school (the closest one to us and also public) sent out information with a centrelink form to claim back the $120 per year we had to pay and an explanation of why parents have to pay that amount. That school didn't even make the interview. We definately were not going to send our kids to a school with kids who'se parents have that type of "entitlement mentality". We are now paying $15000 per child per year and are happy with no explanations about money, just happy that our kids are happy and performing well.