I reviewed those scenes (since you asked!)
For me there is a simple top 3 priority in what scenes I like,
1 ) A girl I think is hot
2 ) Sexy clothes / makeup
3 ) Interesting location or "set up" to the scene
Looking at your scenes I just wasnt drawn to the models, for similar reasons to those mentioned above (i am not so keen on massive tattoos, augmented bodies, piercings) , I must say the Harem one has lots of beauties in it, but I am just not into the Harem thing. I prefer everything to be focused on 1 girl
I do think its awesome you are asking the question! Reading through the answers shows me how complicated it is to try to satisfy all of your consumers!