The low star raiting is based on the fact that the game looks like a regular VN while it's not. It's more like point&click adventure of old times, just with gazillion words on top of that. So, when people (especially not experienced in games generally ones) are trying to get through all of it in order to see some action, they are get stuck a lot and get frustrated as fuck. At the same time, there're really not much of adult content. In fact, correlation tedious stuff/grind/questing to fun/adult stuff is ridiculous. Thus as an entertaiment product for average user it's next to worthless. But if you can appreciate a longread fanfic and not afraid of some point&click stuff it can be even recommended to play.