The best managers are those that

1. Lead by example
2. Make decisions that work for the betterment of the workers and customers. Not just their profit margins.
3. Understand that each worker has different strengths and weaknesses, help them utilise their strengths and don't make them feel like shit for their weaknesses.

My best manager was at iiNet. Only problem i had was that he had upper management breathing down his neck which was not his fault.