I definitely wouldn't call the game's depictions of women "problematic." But I would call them weak.
God of War's strength is in its study of masculinity and reframing male heroism through a feminist lens. God of War is about toxic masculinity constructs and it explores those themes extremely well. It does this by primarily positioning Kratos and Atreus against or adjacent to other male figures (including each other) so there is a point of reference to examine character traits typically associated with masculinity. A great companion documentary to God of War that explores these themes is
The Mask You Live In, which I recommend to anybody who liked the game.
There is nothing wrong about having a story that focuses specifically on men and male relationships, but this game does include and portray women, which means those women are fair game for criticism and analysis. The truth is that as good as God of War is, female characters are not a narrative priority, and therefore they become storytelling tools that don't receive a lot of opportunity within the story.
There are three major roles for women in the game:
Faye, whose death serves as the inciting incident for the story ("fridged").
Freya, who is a slightly-mobile captive with little agency (damsel trope, defined by her relationship to male characters).
Valkyries, who are all turned evil and held captive (Rescuing women with violence trope, damsel trope).
This much is not disputable. These are literary devices that are tried and true that can be handily applied to all of these characters. It is unfortunate that, since there are so few women in the game, the ones that are present lean so heavily on literary stereotypes. None of these women are particularly "good" female characters, but for relying on the tropes they rely on, they could be worse. Faye is still portrayed to have been a hero and a radical in her own times. Freya's story ends with her being individually motivated and off to reclaim her birthright and she is a strong foil to Kratos himself. The Valkyries are all free and have returned to being the dominant militaristic force in the universe. These are good positions for the women of God of War to be in for our sequel game. But for God of War 2018, women are not a narrative priority, and it shows.
These women rely on tropes and stereotypes that serve as weak female story roles. You could argue that Faye and Freya and the like are still interesting characters, but their role in the story itself is utilitarian and merely ancillary. It is unfortunate, for example, that the Valkyrie all need to be murdered by Kratos so they can all go back to being battle angels and are imprisoned until he gets there. Characters of such power and stature deserve better than to sit and wait for Kratos to come kill them so they can be rescued.
Is God of War 2018 better to women than older God of War games? Absolutely. Could it be much worse? Absolutely. But being better than the old games and having had the potential to be worse is a low bar to meet.This doesn't make the game "problematic," but it leaves a lot to be desired in this department. It's been a prevalent conversation among fans since its release.
God of War 2018 is one of my favorite games. I think it's a tremendous piece of art. My experience with the game was deeply personal and formative and there are few games I have ever played that I can say effected me so profoundly. It is a transformative video game experience. But the game has problems, and there are parts of its story that could be better, and chief among them is how the game portrays women.
I like to think the story is going places and the clearly-planned over-arching narrative has roles in store for both the women we've met and the ones we haven't. I'm fairly confident that the reason we never see Faye's face or what she looks like is because she will appear in some form in later games and her character design is either not complete or is meant to be anticipated. Freya is obviously set up to be a primary antagonist. The Valkyrie all serve Freya as their queen. Plus there are obvious mythological figures like Hela we haven't seen yet.
But until then, God of War 2018 is a game that doesn't have very good female characters and they all rely on tropes to fulfill roles in the narrative. They aren't the worst offenders when it comes to using these tropes and it's still possible to like these characters despite the stereotyping but I don't know why anybody would harp on somebody else for saying they expect more out of female characters in their stories. Hopefully, by the time this story is complete, this isn't something we will look back on as a series failing.