Having sampled many AVNs on here since 2018, I kinda scratch my head when people talk about "bad writing" in SG. Bad writing compared to what, exactly?
As a native English speaker, writer, and reader, I don't find the SG writing or dialogues particularly bad, especially compared to the majority of AVNs on F95. Yes, there are some things "lost in translation," so to speak, and some grammatical and spelling errors, but I find much of the dialogue feels natural.
Not once I have read the word "Succubus" (which, by default, reveals which part of the world the writer comes from) and I haven't read any typical F95 AVN trope dialogues, such as... Daughter: "Daddy?" Father: "Yes, honey?" Daughter: "I want to suck you pee-pee. Please, Daddy?" Father: "Why certainly, honey! What more could a good father do." CRINGE!
I have seen accusations the writing is bad because Wollust college, collage sport, and minutiae like getting a drivers license don't resemble real life. Talk about not seeing the forest for the trees. Practically every Sci-Fi and Superhero movie, and every police procedural, courtroom, or hospital drama on TV is the same. Besides, some of the minor things (such as Ocean's choice to use a real-world medication in Ch 5) are easily fixed.
I use the same suspension of disbelief in SG that I use for movies and TV shows. That way, I enjoy the story without getting bogged down in irrelevant minutiae. I kinda SMH when reading Sci-Fi TV show fans questioning the physics or logic of some particular piece of technology. It's like, dude! The whole show is based around false physics and logic! FTL drives, sub-space, every alien race speaking American English... etc.
So far, the overall character narratives in SG make sense and there is an in-built complexity to the character relationships and dialogues, i.e. player choices matter in a way that isn't simply determining the order in which the MC porks every female NPC in the game. There is a lot of character backstory revealed throughout the game.
There is very little in the way of major plot holes - the biggest of which, IMHO, is the MC/Nami relationship. That relationship needs to either go all in (i.e. be clearly stated as originally intended, meaning goodbye Steam and goodbye Patreon) or unambiguously redefined away from the original intent. Otherwise, certain aspects of the plot and dialogue don't make sense in the official version of the game. For anyone saying that the MC and Nami HAVE to be blood-related for dialogues relating to a taboo relationship to work, I say, Nah! They have been under Nojiko's care since they were small children. Get the surnames right (i.e. the MC and Nami sharing Nojiko's surname) and make some minor changes to dialogue, and society would still view them as "brother" and "sister" because that's how they've been brought up (a one parent, two children family). This way, a relationship could still be viewed as taboo but not be illegal.
Of course, others will have their own take on all of this. That's fine. Everyone views SG through their own lens and no game is beyond criticism.