Ikimashou

if they are attractive, then consequently they evoke positive emotions, and therefore should be higher than a five. right? An absence of emotion means there are neither negative nor positive ones

No-no-no... A Nihonka with the most mediocre appearance (5/10) >>> what was in this list. The scale must be functional.

I just see teeth irl and such wide front teeth are rarely encountered)

That's simply a racial characteristic.