There is a consistent tone that runs throughout all of these texts, one appropriate to a creation story for a religious tradition. The text reads in a matter-of-fact fashion, including the Annals. Tolkien only covers stories without much detail and little dialogue. Yet these writings range through tens of thousands of years, noting only the most important events. Nonetheless, the tone has a matter-of-fact element combined with the grandiose.
Christopher Tolkien's tone can be excruciating, particularly in contrast with the serious, fascinating narrative written by his father. Tolkien discusses mythological events over thousands of years. But Christopher focuses on reasons Tolkien could have changed this or that word, on modifications of the texts, changes of names, emendations of lineage and the like.
The Lost Road and Other Writings