How to evaluate Wang Mang, a legendary figure?

Wang Mang comes from a prominent consort family, and his aunt is the Queen. He was definitely an alien in the family at that time. He lives a simple life and is humble. Moreover, he was diligent and studious, and soon became famous and was regarded as a moral model by everyone. Wang Mang should be a very good actor. After he entered the role, he always performed the performance according to the requirements of the role. At the age of 38, he became a fu and began to govern. He still performed the role of sacrificing himself and recruiting talents. The rewards and money he received were used to entertain celebrities, and his life was more frugal. Once, a hundred officials or bureaucrats came to visit his mother. When they saw that Wang Mang's wife was poorly dressed, they thought she was a servant of his family. During his retirement and seclusion, he even forced his second son to kill a domestic slave. You know, at that time, it was not at all one thing for a noble family to kill a domestic slave, and his reputation was getting higher and higher.