While I haven't personally played it, it seems that it kinda took away from the power fantasy that's the point of shooter/action games, explaining it's bad reception on top of the horrible character assassination.
Well here is sort of the thing. Other M would have worked well as a prequel.
The fact that it happens after a game where Samus is by all means already awesome. Means that the game deliberately makes her weak after two games where she showed herself to be competent and strong.
Which could be a good narrative in it of itself, afterall you can easily imagine Samus being sort of harrowed by her adventures through both Metroid and Super Metroid. She shouldn't be doing this mission or taking the call, but she has to anyway. She doesn't have time to get help and get better because her wellbeing isn't more important.
Yet the narrative of the game doesn't do a good job in justifying her sudden fragility nor expands upon her relationship with anyone else. Just "My baby died, ohh my Ridley sure is scary all of a sudden!"
She is bossed around Adam because not only does she trust his judgement, but to her he is like a father (ontop of the adopted father she already had. But really father figures aren't limited to one). Yet the game doesn't focus on their relationship within the construct of the game and doesn't give a reason as to why she would follow his orders beyond what would normally be acceptable.
As well to say she has PTSD is a fine assessment of the reasons why Samus is extra fragile in that game and on surface value that is fine as well. Yet it is how the game demonstrates this PTSD that gets in the way. She never has panic attacks in the middle of conversations (minus one), as well the fact that it can destabilize her armor is a sizable design flaw. The game's reasoning as to why she has PTSD that way can be summed up as "She is a woman, she experiences PTSD by becoming a vulnerable little girl". Which again would be fine if Other M was an exploration of her life story through this ship, possibly making a point that when her parents were killed she just kind of stopped and folded into herself and the PTSD sort of reverts her and that she needs to finally move forward.
I guess what I mean is.
Other M basically says "Samus is a woman" as an excuse that goes without saying.