It is especially effective work on the position of the "axiological neutrality" according to Weber (the opposite of Marx) where he thinks the scientist -although it is an opinion, policy for example- should avoid issuing a value judgment in his work (basically, try the chimera of objectivity).
A chimera of course, but a necessary illusion, strive for objectivity, even if ever you get there is an imperative to avoid falling into pure subjectivity and relativism.
It is also a testimony of a university in the early twentieth century on the German system, compared to the American university system.
Nb: I have no a priori on Raymond Aron, but I find that the preface is arduous and somewhat educational for someone wanting to discover Max Weber. For example, speaking of the Neo-Kantianism dice the preface without explaining what develops this thought is a lack of pedagogy against productive if the goal was to transmit knowledge.
