It should have philosophy, praying with saints, and about ethics. It need not have very much Christology. Further, I would very much like to see that the book had A LOT of small and more or less precise topics, but also some general explanations. I would prefer that the book was not antiquated. As it will be the only book I'll buy about Orthodoxy for a while, there should be a lot to read and reflect over. There should be some daring thoughts in it, not 100% accepted. I won't object to reading a lot of "boring" details.