Hot brother clone fist fighting about who is the better warrior man on a nuclear mech surrounded by fire etc.

What are you talking about, there's nothing sexual about shirtless fistfighting, that's just how Real Men Settle Their Differences!

Metal Gear Solid 1 felt markedly less self-aware and ready to poke fun at itself, Solid became a much sillier character from 2 onwards (which I approve)