The biggest gameplay problems with Other M are the blind pixel hunts when scanning, and the concessions made to fit the game on a single Wii Remote. Let that game breath on a Pro Controller and it would improve dramatically.
Right. It's been 10 years since I played it, but I remember having fun, but cringing during the cutscenes.
Replace all the cutscenes and change the tone of the story. Samus needs to be a bad-ass. Make the pixel hunts cut scenes of Samus being bad-ass instead of pixel hunts.
Move the dodge button to a shoulder button, and put a timer on it like the counter in Dread, but cut the timer on a successful dodge so that you can do multiple successive dodges.
Make half or more of the marines women.
I actually have a big list of changes for each Metroid game in the main storyline.
Metroid Zero Mission - emulate on switch. adjust the ending rewards. We don't need samus in booty shorts and a sports bra as a reward.
Samus Returns - port to Switch adjust anything as needed.
Super Metroid - Bring the controls in like with what we see in Zero and Fusion.
Other M - Notes above - alternatively remake in MercurySteam engine.
Metroid Fusion - Adjust text to make Samus more bad-ass and otherwise the same notes as Zero Mission.
Otherwise the Prime games should get ports and maybe adjustments. Make compatible with Wii controls. Like really. Do a USB sensor bar just for this. Sell some more Wii controllers and Nunchucks.
I have no opinion on Federation Force.