I'm a huge fan of the first film which I think is a perfect movie in all ways. As a sequel, this film just can't live up to it.

Firstly the characters in the first film had a balance of realistic and comedic which made them feel unique and the entire family felt alive and filled with personality. In glass onion, the characters aren't nearly as compelling and often feel too comedic and not like real characters.

Secondly the mystery here is pretty lackluster and anticlimactic. The killer is very easy to figure out and while there's an unpredictable element to the mystery, it doesn't affect the main killer or anything.

Thirdly, I did not enjoy the third act. After a very interesting twist and a flashback that sets up the third act, there's a bunch of gaps in logic (one featuring a book) and the film ultimately ends in a very silly way that isn't nearly as satisfying as the first film.

Overall, the film doesn't have good characters, has a predictable and overly simple mystery, and a stupid third act.