Atwood herself prefers the term "speculative fiction" -- just because the term "science fiction" connotes spaceships and robots (rightly or wrongly). She talks a lot about the various genres -- and how meaningful the distinctions may or may not be -- in her book In Other Worlds: SF and the Human Imagination. (A very good read, btw.) I happen to agree, for her books it definitely fits better than the scifi label. LOL, I did exactly the same thing when I ran into her in Scotland! I found Oryx and Crake interesting, but I didn't connect with it. At all. Largely because of the male protagonists. I liked Year of the Flood a lot. MaddAddam was only okay -- too unfocussed, and some character points that bugged me, but not a bad end to the trilogy.