While my main choice for eroge, hentai, and doujinshi mainly fall on the light side I still enjoy the dark stuff if the artwork, voice acting, and even writing is good. For instance, a good game from Black Lilith I regard in the same way I would a good exploitation flick; the writers know they aren't writing anything close to high class so they go as over the top with their dark content as they can and usually have some brief but surprisingly good action scenes to the side and it somehow comes together into an entertaining little romp.