I'm always surprised by people saying this. First of all, I've seen people have the exact same complaint about Knives Out - that it was obvious who the killer was from the outset. I don't necessarily agree but I guess with only so many suspects, enough people are going to shout at the screen "He did it!" and be right, and the same will be true of Glass Onion. But in Glass Onion >!the film sets Miles Bron up as the victim with the murder mystery game (plus maybe my familiarity with The Last of Sheila and the fact this film was inspired by it meant I assumed it would follow the same set up as to who the victim was), and how could you know he was the killer half an hour in when a murder, as far as the audience knows, hasn't even happened at that point? And when a murder does happen, it's made to look like Bron was the intended target!<

I guess it depends on how you go into the film. It feels to me, and I may be wrong here, that a lot of people who didn't enjoy the film went into it with an adversarial relationship, treating it as something to outsmart, not letting its tricks work on them. Sure you might figure out the mystery by intentionally disregarding what the film is telling you, but clearly it will leave you unsatisfied. Maybe that's a sign its tricks are poorly crafted, but (and this is obviously anecdotal so make of it what you will) I've watched it with five other people now and we all thoroughly enjoyed it. None of us guessed who it would be or found the solution unsatisfying, which I think is pretty impressive since it's deliberately unsatisfying lol.