Perhaps some of it has to do with the fact that in most other places, Japanese are quite a minority and people are attracted to those that don't look like themselves? If there aren't that many around, when you see one, they look different and appealing, so one's thoughts go a bit askew....
In general, I don't think they look any better than anyone else. There are super hot ones and super "not hot" ones. (I don't want to be rude).
I do like their eyes and their usually high cheek bones....
