There is a scene in MGS4 where three of the protagonists are absolutely swarmed by dozens of soliders in a tactically unfavorable environment. (They're completely surrounded, literally by 360 degrees, it being a circular room and they are in the middle. Also, IIRC they are trapped in the low ground because the room sloped downward toward the middle). There is a veritable torrent of bad guys flooding into the room.
Not only do the three protagonists survive this Kobayashi Maru, but during the looooong gun fight, a romantic relationship blossoms between two of them and they propose to each other.
In the middle of the aforementioned, impossible-to-survive gunfight.
That's pretty much all I have to say about this game.
(PS- if you're pissed because you consider this to be a spoiler, I don't care. It's like giving away the ending to Catwoman. Or National Treasure 2. If my actions save just one person from playing this game, I've made this world a better place. Heck, some of the gameplay elements were derived from the fact that you control an old man. Seriously. You have to deal with back aches and a bad heart. I am not even joking. Hideo Kojima's next game is rumored to be a sports game where you try to play soccer as Kevin James.)