I think they would probably look unattractive to regular people, because they would look fake and artificial by being so perfect. Being imperfect is part of what makes us human. That reminds me of the Making of Silent Hill 2, where the leader of the project said that he on purpose made the characters imperfect and got non professional dubbers and motion capture people in order for it to be more realistic and for us to be more able to relate to the characters. The guy (named Guy by the way) who dubbed the main character was a business owner for example. There is also a phenomena which I cannot remember the name (I am terrible at remembering spoken word), whereby when you make a robot with some human features, it looks "cute" and "interesting" up until a certain extent. If you put on a graph whereby going to the right the robot looks more human, it reaches a point where people find it repulsive and scary. If you continue down this trend, however, and go past this repulsive and scary part, people start "liking" the robot again. In a different tone, when we look at seriously disfigured people and/amputees, most of us get scared, even if we know the person does not present us any danger whatsoever. Reason being that it goes against of what we are used to think of as humans. We usually imagine that humans have two legs, two arms and so on and so forth.