How to correctly evaluate Cao Cao from a literary perspective?

He can break through the shackles of traditional literati's prejudice, accept the influence of the folk songs of Han Yuefu, express real life and emotions by using the ancient themes of Yuefu, inherit and carry forward the realistic spirit of the folk songs of Han Yuefu, and enlighten the literati to imitate the ancient Yuefu for poetry creation. Poetry is full of bold colors, reflecting the changes in its political life. Although the old Yuefu style was used to create a new way, it was not bound, but it inherited the spirit of "feeling sadness and joy, starting from things"; There are three kinds of contents: reflecting the reality of the turmoil in the late Han Dynasty, unifying the ideal of the world and the indomitable spirit, and expressing unforgettable negative emotions. The form of poetry is very innovative. Cao Cao has profound cultivation in literature, calligraphy and music. In artistic style, Cao Cao's poems are unpretentious and unpretentious. They won with deep affection and charm. Poetically, it is characterized by generosity and sadness. Generous and sad; It plays a constructive role in Jian 'an literature. Cao Cao was one of the few emperors in ancient China who made great achievements in literature.