Metroid Other M: Look, the story is awful, but some of the gameplay features like grabbing, dodging, countering...all of that made Samus feel very bad ass and bled its way into Metroid Dread. Sure it isn't deserving of the 90's, but give it five points up for the graphics (amazing for the Wii) and gameplay. Though I will say the first person thing was a bad idea and they should have let you use an analog stick.
Other M's score is one of the most undeserved I've ever seen, gotta agree with you on that. Not so much on the rest of your argument, though.
The story is terrible and the gameplay is even worse. Having the sideways Wiimote as the only control option was an awful idea and then turning it to do motion-aimed first-person shooting has to go down as one of the worst gimmicks ever conceived, I have no clue how that made its way into the finalized game. The graphics are impressive for a Wii game but the art direction kills the game's visuals, everything looks bland and lifeless, plastic even. Samus' design is particularly bad.
There is nothing decent about the game, really nothing at all. Its metascore isn't as low as it is because it was judged harshly compared to other Metroid games. Instead it's the Metroid name that carried Other M to much better scores it'd have if it was its own thing. It deserves a 50 at best.