Lurking behind Halakhic Man is a mystery. Rabbi Joseph B. Soloveitchik describes two types of personality. On the one hand there is cognitive man, the familiar atheist-scientist type, who understands the world through its natural laws and is blind to anything that can not be perceived through those laws. On the other hand there is the equally familiar homo religiosus, the religious-mystical type, who sees the world as a prison for the soul which he longs to transcend. And yet neither of these describes the traditional Jewish scholar of the Talmud, so Rabbi Soloveitchik proposes a third type, halakhic man, who combines certain aspects of each of the other types (without being a synthesis of the two) as well as certain key features of his own.
Halakic man is like a mathematician, approaching the world with a pre-existing model, the halakha, and hoping to find correspondence between the two. Indeed, halakhic man seeks to remodel the world on the lines of the halakha, to make the natural closer to the ideal. In this way, he reaches God, contrasting with homo religiosus, who tries to reach God by leaving this world entirely for the world of the spirit. Rabbi Soloveitchik asserts that halakhic man is interested in every real phenomenon, because everything is included in the all-encompassing halakha, but I can not avoid the impression that it makes him rather narrow-minded, although that might just be a reflection of my prejudices.
One thing that puzzled me about the book is Rabbi Soloveitchik's assertion that halakhic man does not battle with the world, so strong is his desire to actualize the halakha in it. The implication seems to be that he has no worldly temptations, being governed wholly by the halakha (in the notes I wrote while reading, it says that halakhic man does not battle with temptation, but I did not include the page number and can not find the relevant passage to see if that is a direct quotation). This seems odd in itself, doubly so when Rabbi Soloveitchik later describes the process by which halakhic man performs teshuva (repentance).
Another question I had concerns Rabbi Soloveitchik's assertion that halakhic man is neither excessively happy nor excessively sad and although he experiences religious rapture, this is only after a cognitive experience. This seems to be a sign of a well-balanced psyche, but the stories he tells to support this claim, of rabbis who were able to withhold their feelings of grief at the loss of a loved one until after Shabbat or Yom Tov or the performance of a mitzvah might indicate a form of repression.
I also have to question the statement that hymns and songs to God "waste... time". Granted they are different to Torah study, but I am not at all convinced that they are an inferior method of serving God. Furthermore, I feel that they can be an important part of the religious/psyshological experience and that halakhic man does himself a great disservice by avoiding them.
Another question comes from halakhic man's opposition to halakhic innovation for the sake of policy. This would seem to be primarily a criticism of Progressive Judaism, but it raises the question as to whether halakhic man could approve such controversial innovations as the prozbul and the heter mechira. Rabbi Soloveitchik approved of the latter, but it seems to me slightly out of keeping with the dogmatic halakhic stance of halakhic man (although I believe Rabbi Soloveitchik also denied being a halakhic man).
Finally, as the Talmud contains two main parts, the legal, halakhic, sections and the non-legal, aggadic sections, calling the book Halakhic Man automatically (to my mind at least) raises the question of the existence of aggadic man. Aggadic man would probably complement halakhic man rather than oppose him. Aggadic man would have a historically-aware view of halakha as an evolving discourse, not an ahistorical view of halakha as a Platonic ideal world (although in the actuality is probably a mixture of the two - some parts are unchanging, others are not). Aggadic man would be driven to find the unifying ethical principles underpinning the Torah, the rationale behind the mitzvot, rather than seeing them as simply a product of the Divine will. Moreover, while halakhic man is, of necessity, Jewish (Judaism not considering non-Jews as bound to keep Jewish law), aggadic man, being a student of human nature and ethics, can be Jewish or non-Jewish. Yitro, Moshe’s non-Jewish father-in-law, who created the Israelite legal system not from prophetic revelation or rabbinic exegesis, but out of a concern for justice and equity and an understanding of human nature, might be considered a paradigm of aggadic man.