What is the author's style in Literary Theory: An Introduction by Terry Eagleton?

Eagleton is a professor and academic who has spent years studying literary theory and its history and he is obviously very familiar with his subject matter. Eagleton is explicit from the book's opening that he is biased and opinionated and, further, that he will make no attempt to be objective. This is consistent with the general premise of his book; according to Eagleton, true objectivity is impossible and anything which claims to objective is dishonest. Eagleton's bias, then, is that the modern political and social structures are oppressive and need be to transformed or even abolished in favor of a socialist society.