Alien 3, like many sequels, falls short due to a pivotal creative decision that undermines its overall quality. The movie begins well, boasting a great lead performance from Sigourney Weaver and an impressive supporting cast. However, it takes a drastic turn in its opening scene.
The film kills off two beloved characters, Newt and Hicks, in a shocking and insensitive way. This choice sets the tone for a disappointing narrative that struggles to recapture the magic of its predecessors. Despite some redeeming qualities, the movie’s poor start makes it difficult to appreciate its better moments.
Source: https://whatculture.com/film/10-horror-movie-sequels-that-took-risks-and-failed?page=2