There is reality behind the words of the books of Musar of the disciples of Israel Salanter. It is nor the words of their books, but rather there is the reality behind the words. As the Roman saying goes: "Acta non verba" (Actions, not words). When I learn or hear the Or Israel or Madragat HaAdam there is some aspect of fear of God or trust in God that enters my soul. The reason is that these people worked themselves to come to fear of God and trust in God.
The Musar movement [and in a wider context the Litvak Yeshiva] has the advantage of representing authentic Torah. Not just intellectually, but rather in the whole spirit of Torah that permeates the Litvak yeshiva. The rest of the religious world seems very false to me. The façade of Torah, the whole showing off is very foreign to Torah. But more so. It is like the pig that stretches out its hoofs to show that it is kosher, but hides that fact that it des not chew the cud. Or like the idol that was dug up on Mount Grizim which showed that the Samaritans were in fact serving idols. But it was hidden.