Basically, because it's almost been 5 years and there isn't a single scene of the kid with his adoptive mother. The renders are good and all, and the mother is hot, but the lack of anything, not even a single male roleplay scene, is very frustrating. You start the game and see that it's so old, and you think, with so many years of development, there should be many more scenes if there's a vaginal sex tag (the only scene is with her husband). The most she does with the MC is he smells her vagina, and little else besides pinching and grabbing her ass.
Like I said, VERY FRUSTRATING!
The rating is overrated.