If you want to know why people despise Metroid Other M, this quite from this video sums it up:
www.youtube.com/watch?v=IZSxcU…
"[Samus] has gone through many trials, strengthening her as a character. And in some of these trials, overcoming emotional hurdles for the benefit of her mission, making her a stronger person. And of course, as we all know from the first Metroid that Samus is in fact a woman. This means that she is a strong and independent woman and is presented as such in her games. It doesn’t mean that she is a pathological ice queen, especially considering how many times she has rescued animals, baby Metroids, or even a race of people like those on Aether. She has emotions like everyone does, but in all these past titles, they are either used for good, like rescuing something, or presented to her as an obstacle for her to overcome, or even just her own reflection on the events surrounding her. All of this is pretty much a good and typical way to treat emotions when dealing with almost any character, male or female, in any medium, but this is not the case in Other M. Instead, Samus is overtaken by her emotionally frail state, never overcoming her insecurities, and is instead held back as a woman by her emotional struggles. And this is where I feel most of the controversy over Metroid: Other M comes from."