Okay, so I'm going to respond to a few enquiries now:
This BIG BOSS run doesn't look stealthy so what's the point of having that category? The guards in MGS1 are really, really stupid and only tend to patrol on specific paths. A regular non-stealth run would involve just running in an even straighter line and dodging the occasional bullet. The difference between a normal run and a BIG BOSS run becomes much more pronounced in the later games once the AI improves. And because DarkKobold made a comparison to Hitman: getting Silent Assassin rank on missions, especially in the later games, involves a LOT of waiting, while Metal Gear stealth runs are still fast-paced as well as sneaky.
I want a plot run! As you might have noticed during Liquid's speech, PSXjin does a really bad job at emulating voice acting in this game. And at any rate, there's an excellent five-hour [URL=
http://www.youtube.com/watch?v=WpG9XIfFkE0]longplay[/URL] done by RickyC if you really want a plot fix.
Also I agree that a Twin Snakes run would be great as well, but there's so many changes it's practically a different game altogether.