Okay.....What I'm about to say is only based on reviews, playthroughs, and my own personal opinion. I don't mean to insult anyone's opinion of this game; I'm just here to give mine......And I think that Metroid: Other M is a complete waste of the Metroid license.
First, the lesser concerns; the story and characters. Story in video games ARE an important aspect of fiction, but Nintendo has proven time and time again that they can make a compelling adventure without the use of story-telling; and even then, when Nintendo DID have a story in their games.....They were really good. Like.....REALLY good. So what's wrong with the story in Other M? Well, everything, really. After all, the biggest complaints from fans were the various inconsistent plot points, lack of a compelling adventure, and most of all, the butchered back-stories of the beloved characters; Samus in particular. Hell, the story was so bad, Nintendo had to actually REMOVE the Prime trilogy from the timeline.....the only Nintendo timeline that actually had chronology to it!......You've got to be kidding. It doesn't help that the aforementioned Samus has been depraved of her badass reputation in favor a demur, emotionally crippled female character. Thanks Yoshio Sakamoto for ruining your kickass heroine in one fell swoop of a game! Oh, but that's not all; the game is the MOST LINEAR game in the series, bar none! You literally go from place to place,with no exploration at all, removing the atmospheric charm of this adventure game series; the series that practically coined the entire GENRE, WHAT THE HELL?! And finally, the biggest offense this game committed, which not many games do.....is hurt the franchise by just existing. Other M didn't sell well, leaving the Metroid series to possibly taking a break, or worse, since we've ended the Metroid timeline, the series just ending...
And on such a sour note...