I agree that the game is both really good yet it is also somehow overrated when people act like it's the greatest thing ever. It's a 10/10 relative to other AVNs on here, but it's like a 7 or 8/10 overall if were talking it a a piece of media as a whole.
The writing when you really get down to it is pretty damn average, BUT the presentation of it is Eternum's key to success. Many devs slack on the "little" things, (esp audio) so even if their writing is better it won't shine through. Whereas Eternum basically takes a typical story with typical characters and dolls it up to make it look way prettier, and honestly it works. Critically looking at the writing does make you realize it's has many trite story beats and characters though. Think of those typical shonen anime with really good acting, art, and animation that end up being a better experience than some that may have a better story.
That said this game is like the Toby Fox of F95 bro, you are NOT gonna win an argument where you speak remotely negatively about it on here LOL
What would be the reason to go into a thread dedicated to one of the top games on the site, that houses people who enjoy it and then speaking about them all as if they haven't heard that before? Don't you think in 2200+ pages, people have had negative opinions and ironed out good things and bad things about the game?
Further, how are you saying the writing is "damn average?" There's games with bad Engrish, bad display, and lackluster compulsion while Eternum is well known for its comedy, music that fit the mood (changed after some complaints, but I digress) and feels compelling to the point that our resident conspiracy theorist can go ham on speculation while giving us engagement.
I don't know what story beats are "trite" by your standards, but different shonen anime have different things coming through with it. One Piece is not Naruto is not Bleach, etc. So I fail to see what "typical shonen anime" this one's following. Even certain Harem comedy has different things going on like Ranma 1/2 or 5-toubun no Hanayome so I find it a bit silly to say someone is gonna understand this one if they read "typical shonen anime". Just because I read HxH doesn't mean I'll understand this one. Enjoyment is another thing entirely.
And sure, it gets criticism and the story has its drawbacks which fans do acknowledge but it's weird to claim that's based on following a formula no one knows and saying it's average based on superficial reasons.