These books are nominally sci-fi but really have more of a fantasy flavor, especially the second and third installments in the trilogy. Heroes, gods, monsters, epic quests, nukes, and lots of human-human and human-alien sex. In other words, all the ingredients of a pulp space opera. The series makes good beach reading but parts of it are not for the squeamish, so be warned. The dust jacket of my copy of "Titan" compares it with Frank Herbert's Dune books, which is ridiculous, but all in all these novels aren't a complete waste of time.