I remember the last time I tried to have a simple discussion about Shenmue 3, it was over on reddit. When guy said that "Shenmue 3 was pure garbage and one of the worst gaming experience I [he] ever had" to which I answered "I think you're exaggerating about this. Shenmue 3 is disappointing and not as good as Shenmue 1&2 [I personally rate it 6/10], but it is not pure garbage. Out there, there are REAL pure garbage games, that are barley playable and where absolutely nothing works, while Shenmue 3 still has some genuine qualities and is still enjoyable for many parts. And I can show you a few YouTubers who took time to play actual garbage games, and you may be able to see why Shenmue 3 isn't one of them" to which he answered "I don't care what you'll say. You can argue until you're face get blue and you scream [like, dude, I'm being polite and calm, you're the one getting all angry], I won't listen to someone like you who don't understand gaming", so I just said "OK" and let it go. I can't comprehend how and why those people don't even want to have a genuine discussion. I'm not saying that they should suddenly like Shenmue 3, they have every right not to, but at least, stop thinking that you're opinion is the only real one.
On another note, one French journalist from Canard PC once said something really interesting, that I think is true and can explain why people shit on Shenmue so much. He said (and it was unrelated to Shenmue in this context) that we were living in a "golden age" of video games and that so many games were released every year and such great games that today it is almost impossible to play a really bad game by mistake and that people also became very picky because they were too used to play good games.
I think it's the case with Shenmue 3. Shenmue 3 isn't a great game (by my opinion), but it is far from being a bad game and from being a garbage game. The thing is, people who shit on it probably played only good to excellent games in the recent years, and so having to play a game that is a bit below those games are "garbage" to them, while it objectively isn't.
Like I said, I look often over a YouTuber who like to play the worst games you can find on Steam. Games that actually deserves to be called garbage and be rated 1-2-3/10, games that are so so bad that they are barely playable at all. The problem is that most people don't even hear about those games, so they can't judge what is a really bad game.