Well, bad parenting does not always result in bad kids, like the world believes. Just look at Dave Pelzer. He went through a living hell, and once he was out of it, turned his life around to help people. His story has inspired millions against the horrifying act of child abuse.
I believe that a good parent should always be proud of their children, even in the midst of their kid's failures. To have a parent be proud of you as a child generally makes you want to succeed, makes your determination and will to do better, stronger.
For me, as I went through HS and struggled in math, it was their readiness to help, and in the end, telling me to drop Geometry so I could take something beneficial and worth my time (Which was Psychology, since I'm studying to become a Psychologist, which I got 103.3% in as a final grade)
It wasn't them giving up on me or my ability to comprehend math, it was them wanting to see me do something I knew I could achieve more in. I agreed, and fought the school to drop the class. Which happened, obviously.
I believe that my parents were quite successful in raising me and allowing me to shape myself into a person I so chose to become; a girl true to her beliefs and failures, but also one who wants something realistic in her dreams.
They help shape a child's nature, no doubt, but they don't have control over us in everything we do: we're not puppets, we have a brain, and we have free-will. They can only help us along the way.