"emphasis was clearly on the Miko dressed girl" what wrong with that? DxD emphasis on Rias, Shinmai Maou emphasis on Mio, Sora no otoshimono emphasis on Ikaros. There is no problem with emphasis on a single character at first and than expand out more later.
Bro, it doesn't matter if these series success for po** addicts or by plot or anything, different author different way, a success is a success. You said "Any harem that has more than 3 girls is doomed to fail as a manga" so i give you example of harem manga that has more than 3 girls got successed.
Oh and from your first comment, i will assume that you said the mc of this series is spinless or the girls are useless. Please tell me how the he** did you come up with this when it only been 8 chapter???