The "less is more" approach has always worked best for a character like Samus.
After playing through the first hour of Other M, it really does feel like the makers basically turned back the clock and rewrote the character.
Not that it takes away from the game, but if I were a stickler for this kind of thing, I don't know if I'd consider this Samus to be "canon."
Just offhand, why is she so small? She looks about 5'5, 5'6" 115 lbs tops in the flashback cut scenes when Samus has been described as 6'3", 198 lbs since Super Metroid thanks to her Chozo DNA. Basically, she's an Amazon. Physically imposing even without her Chozo armor.
So was she in the Galactic Federation Police before she finished Chozo puberty? Grew about a foot and 80 lbs of sinew, bone and muscle after she left?
The crux of her having this chip on her shoulder had to do with her being female, smaller, weaker, etc. but based on the Samus fleshed out from the original games, she should have been among the biggest, probably the strongest (Alien DNA!) member on the team. It just doesn't mesh, but whatever; every designer is free to take creative liberties to an extent.