I am forever surprised by how many people love this game. I really like the vision and the open world. But I think it just needs more polish.
Trust me, when it comes to Treasure of Nadia, people love the fact that they see new 3D models. Most games, if not the majority of them use the exact same 3D models, just a different narrative. It get's boring seeing the same 3D model(s) in hundreds of games.
Also, the women are naturally beautiful. They don't have these ridiculously huge breasts or asses, and their bodies have this natural appeal to them. I believe, (or I may be speaking for my self here), people prefer natural beauty over the imaginary beauty.
I loved the game, I liked the story, but I never truly loved the story. I loved the girls, and their characters. For example, Dr. Jessica is a kind and helpful soul. Even when the MC tries to simply f*ck her brains out, she always holds him back by saying things like: "Let's take it slow" or "Good things come to those who wait", instead of "Yes, let's f*ck right now!".
Most games with lots of women don't have a lot of built up, either because the developer(s) can't be bothered to do it, or he/she/they doesn't/don't want to. It's always the case with: Here is a game with 5 women, talk to them once, and then f*ck their brains out with the excuse that he had a big dick which magically enchanted them.
At least that's my take on it.