Hmm, interesting, thanks. I played MGS 1 when it came out, multiple times, as I liked it a lot. I don't remember it being so weird, but maybe I didn't pay enough attention to the story.
The first one gets a bit goofy with the evil twin stuff, and the unintentionally funny dialog like "Do you think love can bloom on the battlefield???", but certainly doesn't go nearly as off the rails as the second one.