Yeah, in previous games it was pretty much impossible to really see with our own eyes what Samus 'feels'. I'm pretty sure that if Metroid Fusion was remade in the vein of Metroid: Other M, she would be freaked out to see Ridley again, corrupted by the X Parasite.
In the Prime games, Retro studios purposefully chose not to show any of these emotions. In Super, I'm sure she undergoes through a lot of emotions when she sees the Baby metroid, but again, there was no way to portray that on that tiny, emotionless sprite of hers, short of putting dialogue lines at the time.
I have knows that Samus was a compassionate human with emotions since Metroid II: Return of Samus, when she chooses not to shoot the baby Metroid.
Technically speaking, if you don't count the Prime games (which I think people aren't even though I love them), she's fought Ridley twice only. I'm not sure if Zero Mission's 'other Ridley' counts as a Ridley experience, but I would say that Metroid 1 and Super Metroid are the ones that count, according to Other M. **SPOILER**Although she probably should not be surprised that Ridley is back in Other M, it is the first game in which you really get to see her freaking out. It's a turn-off for a lot of fans, but those fans are retards.**END SPOILER** Fans expected her to be a soul-less cold mercenary with no feelings.
Even in Super Metroid, when she's about to die by Mother Brain, there's a point in the game in which she's 'unable to shoot and move', which 'could' count as a similar problem (only there's no one to witness it and alert her of this, just the player). She's supposed to be so messed up that she cannot control herself... but it could be an emotional problem, not just the lack of energy. So this is nothing new, in the Metroid Universe.
Super Waffle: 24 years in OUR gaming history doesn't translate into 24 years of Samus's Life.