In fact, Jessica Chastain is a good actress. From Interstellar (2014) to It Chapter Two (2019), she has demonstrated skill and charisma, and has consistently delivered on strong characters who confidently lead the movie they are in. However, the same cannot be said of her performance as the antagonist in Dark Phoenix. She is not only bad: even worse, she is entirely uninteresting. Had it not been for the predictable makeup, the viewer would not have been able to tell that she was supposed to be an important character. The complete lack of presence she brought with her on screen is truly surprising for an actress of her caliber.
Given the terrible dialogue, clearly written by someone who lacks any understanding of what human emotions might be, Chastain understandably sleepwalks her way through the movie. Not sure of what emotions her character was supposed to be feeling, she chose to go with the neutral choice: none whatsoever.
In most bad movies, villains can sometimes entertain the viewer by being either too camp, or too serious for the movie they are in. However, Chastain doesn’t even to do that: she is just boring, bringing nothing to the performance. And in an era where most movies get lost in the shuffle, being uninteresting is the worst asset a villain can have.