I played and beat MGS on PS1 and all I remember is infiltrating a base, killing soldiers, hiding under tanks, that weird fight with the ninja enemy, the helicopter scenes you strafe the side of the building. I don't even remember who the final boss fight was. The end.
Man, I tried to watch some of those before starting part 3. But once their start with all this "There are several different Xehanorts from different timelines with different states of darkness in their heart", I lost me every single time. Guess I'll never trully see the light.
I played the shit out of every MGS game since 1998 (except for MGS V which is still on my to-do list) but I gotta admit the plot is incomprehensible. Even after watching dunkus's video. The scenario feels unnecessarily confusing for the sake of spectacle, even Kojima himself admits that he doesn't understand his own games. Really makes you wonder.