In fairness to Lucas, Anakin's love of Padme isn't what converted him; it was Mace Windu's disregard for the morality the Jedi professed to follow.

I regard the Jedi versus Sith as less "Good versus evil" and more "Principle Ethics versus Pragmatist/Utilitarian Ethics" - Anakin reluctantly embraced Principles until he saw that the Principles were ineffectual; even its adherents would ultimately choose pragmatism. It's kind of implied, in-canon within the movies (the books go further in vindicating the SIth still), that Sidious' master might not have been evil, per se; he sought to end death.