The majority of previews have been overwhelming positive, with many outright praising it. Even the ones that are critical of the NPC's, are praising everything else about the game. And even then, from the footage the part with Miles takes like 10 minutes to do, and then Samus goes back to doing things on her own.
Seriously, John's latest video says it all perfectly.
https://www.youtube.com/watch?v=33aUDA9KnMQA lot of this reminds me of the discourse around Prime 3 when it came out in 2007. The early previews had the intro where Samus was being helped by those 3 other Bounty Hunters and you had people say that was total bullshit and Metroid is ruined. Well then the final game comes out and majority of the games interactions with NPC was literally in that games first hour. And those 3 Bounty Hunters that were apparently ruining the isolation of Metroid, all ended up being bosses that you had to kill in the final game as well.
Plus I've watched the footage of the part with Miles and it's like, this is really making people mad? I've seen a lot of games where characters say things way more annoying than anything he said in this demo. It is rather funny how for years people kept saying Nintendo needs to make games like the rest of the industry, and yet when they make a game that's has things that would be considered normal in any other video game, people freak out and act like the game is now ruined. If the part with Miles is apparently suppose to be game breaking, then that makes about 95% of all videogames ruined.
It's like seriously, do people want the Metroid series to continue or not? For a game like Prime 4 to justify its cost, it needs to appeal to a wider audience than the previous Prime game did. Prime 1 Remaster barely sold over 1 million copies on the Switch, despite coming out during the hight of the Switch popularity and had great reviews from both fans and critics. In comparison, something like Skyward Sword HD sold over 4 million copies, despite both fans and critics being way harsher on the original and HD remaster, and with it literally costing $20 more expensive as well.
Games that are about pure isolation with no character interactions are super rare outside of the indie scene. Hell, even many of these indie games that are suppose to be about isolation still end up having NPC's you interact with as well. Even the Souls games which I keep seeing many point to as the perfect example of isolation done right, are literally filled with NPC who talk to you. Some of them are even comic relief characters that kind of sound like Miles. That's why I always laugh when some people point to the Souls games when people say Metroid could be more popular, when it's like, half of the reason for the success of Souls games is the multiplayer social aspect where many people work together to help over come bosses, or be dicks and kill other players. Plus even many you just play single player will use summons so those varies NPC's they've meet can help them during the game as well. So much of the success of the Souls games is the complete opposite of isolation.