Analysis > Enjoyment
My personal level of entertainment does come into play when determining scores, but the actual quality of the elements within the series (story, characters, animation, sound, etc.) tends to be more important to me. Of course I can't be 100% without bias... I do what I can!
Since there isn't a listing for Visual/Sound Novels, here are some I've enjoyed:
Umineko no Naku Koro ni
Super Danganronpa 2
999: Nine Hours, Nine Persons, Nine Doors
Blood Bank, ch. 57 | 6/10 Killing Stalking, ch. 23 | 6/10 Out of Control / Never Understand, Completed ch. 85/85 | 5/10