>>724887890 (OP)
Unadulterated kino, and one of the best games in the franchise to this day.
Stuff to keep in mind:
1. MGS1 is technically the third Metal Gear game. It's a direct sequel to the 2D Metal Gear 1 and 2 games, originally released on the MSX home computers in Japan. The MGS1 has okay text summaries of both games' plots in the main menu (Previous operations, or something).
2. The game jumps into campaign pretty fast, with only a short (by today's standards) intro video playing right when you launch the game. If you want some more backstory and handy trivia, check the "Briefing Files" videos, again found in the Main Menu.
3. MGS is a pretty oldschool game with unique controls and mechanics. If you've never played a pre-2005 video game before, I highly recommend reading the game's MANUAL, and trying some of the tutorial missions ("VR Training"). Don't be ashamed to start on Easy mode.
Everything else is either pretty straight-forward, or you can spam your CODEC to ask for hints and trivia from your radio backup team.