No they aren't. Their supposed to emphasize distinguishing characteristics of a person's looks. If I had nice eyes, they'd draw a sparkle in the persons eye. Big hair? Emphasize that. It doesn't make people look bad, although a lot of the time, negative features are more noticeable than positive ones, so they wind up being drawn easily. Mii's are a type of caricature, to me, at least, because you can tell who the Mii is because they've focused on distinguishing features. When you go to make "realistic" pictures or portraits, like how I consider these home avatars are going to be advertised, you have to be very specific with details, and even then it's hard to tell who is who, and people wind up seeming generic. I highly doubt that if home attracts new consumers, especially because of the avatar aspect, that these customers will be very satisfied with it, whereas with the Wii, you get a less sophisticated, yet more accurate and easy depiction of oneself.