Jason Crawford gives an excellent answer to the question: What can non-Objectivists and doubters learn from the works of Ayn Rand? I like these two points most of all:

If you feel burdened by unchosen obligations to your family, your friends, your community, or the world at large, Rand will help you see that the guilt you feel is unearned and that your own happiness is the moral purpose of your life.

If you feel like a chump for being honest and fair to others, if you feel that morality is impractical and that being unscrupulous is the only way to get ahead—Rand will show you that honesty, integrity and justice are in your own rational self-interest, and that a rational person seeks only win-win relationships with others.

Objectivism’s ethics of rational egoism makes possible win-win relationships with others — rather than playing the martyr or predating. That shouldn’t be so revolutionary in ethics, but it is.

Go read the whole thing!