Neutral, objective. Good reading material for The May Fourth Movement.
It became increasingly hard to understand this period of history as different parties and schools (Communists, liberals, and traditionalists & nationalists) tried to interpret MFM for their own good. As a consequence, history was distorted.
John King Fairbank regarded this book as the "most comprehensive and fully documented study," and other reviewers in Douban also agreed.
One of the historical roles of MFM was to welcome modern ideas, especially science and democracy, to China, an old nation bestowed with thousands of years of history. 100 years later, science and democracy still seem very far.