I can't speak for anyone else, but I disliked Baltar and Six for most of the first season precisely because they were both such one-note characters - Baltar the craven comic relief, Six the evil sexpot. I like them very much now that they've both gained an extra dimension or two, and if there's one thing that pleases me about the beginning of S3 it's that Ellen Tigh seems to be going through the same process.