(this post contains spoilers for both the MGScast as well as Metal Gear Solid 4)
I downloaded it last night and listened to it on the bus to work, then listened to it at work as well. Having played the game (I crammed it during a weekend!) but having never really played any other games (except the Solid Snake "Intro" from MGS2, which is only probably an eight of the game), I would just like to clear up one particular thing you've said. If you have a vague idea who the characters are (like Big Boss and Liquid Snake) then it is quite possible to actually understand the plot, if only through a great deal of concentration during the cutscenes. That said, since I haven't played the other games, I am afraid the finer details of both the plot and the things you're arguing over was lost on me, more or less. But the overall plot (including the AI's, the Patriots, the Philosophers, Big Boss, Zero) I got.
That said...
[spoiler]you're right, the story was constructed to so that Solid Snake would die at the end, since the artistically the story does point that way. However Kojima & co could have deliberately constructed the story as a tragedy so that there they can spring the surprise on the gamers at the end, meaning much of it the narrative could possibly be an intricate red herring. Which, if its true, doesn't make the ending excusable. Its one thing to "play the audience like a piano" (as Hitchcock said) and give the players a good, well constructed twist, and its another to contrive a different twist that feels tacked on. It's an interesting variation of what the
Turkey City Lexicon calls "The Jar of Tang" cliché, only worse thought out.
Although, as a Metal Gear layman, I took the whole ending at face value ("as one of those things" seeing that this was the part where I particularly realized I was ultimately out of my depth with the finer details) I found myself agreeing more and more with your response. Kojima was in an excellent position to do something both great, enigmatic, unexpected and bold, and did none of that with his ending. Instead he just resolved to an unnecessary twist and an old cliché, thrown in for reasons that may remain forever opaque. I can understand his decision is a "crowd pleaser" for many, and technically that is the aim of many games, but sometimes we don't always need to pleased with a "happy" ending. Solid Snake dieing would have been more poignant and even horrifying, and this might have been a milestone in the long-going battle to make nay-sayers admit that games are maturing from a pass-time into an art form.[/spoiler]
I'm probably going to get a lot of flack for the above.