POTENTIAL SPOILERS BELOW DON'T READ THIS IF YOU HAVEN'T BEATEN OTHER M
The essay someone linked earlier was very much an eye-opener for me, despite already just despising Other M, it took it a step further. The abusive relationship between Adam and Samus is very much reinforced several times throughout the game, and she takes it very submissively and begs for Adam's favor, but him being the gruff military man he is, he brushed it off and went on his way. I thought Adam's character was actually fairly accurate, besides him shooting her and his "sacrifice" being totally pointless since the whole ship was blown up anyways. I didn't think he'd be as much of a prick, but there you go. As for Samus, if you think about it, what does she do throughout the game? She doesn't kill Ridley. She doesn't save any of her fellow Federation troopers. And she doesn't even save the ship! The Queen Metroid was the only notable threat she killed, and even MB was killed by the Federation, not her.
But for me, the biggest issue for the whole game, even apart from all of those things, was the Ridley cutscene. Not only does she cower after facing him canonically twice beforehand (since it was her first joint mission since leaving the Federation, I guess that throws out the Primes, particularly Corruption since gee, you work with the GF throughout the WHOLE GAME. Counting the Primes, that's a whopping 5 times since the death of her parents on K-2L.), she has to have Anthony save her and doesn't revert to her badass self until Anthony dies, which could have been EASILY avoided if she just started firing missiles at Ridley from the get-go. Not only does she not shoot him initially, SHE DOESN'T EVEN KILL HIM. He gets up and flies right away after playing dead. Samus merely assumed he was dead rather than making sure he was (a la the Meta Ridley fight in Corruption or looking over the edge in Prime). Insult after insult to her character is basically Other M in a nutshell. /rant /spoilers
As for Ridley's Smash chances, I'd sure hope we'd get an option to change his appearance to Meta, at least. If he's playable though, I'd be happy even if it was Roidley and Roidley only. They actually nailed Ridley's character in Other M, seeing as he took advantage of Samus' aforementioned weakness and smashed her against the wall (inb4 sex joke). A villain trailer would be beautiful in the next few weeks, but we'll see.