Superb, possibly the best game I have played so far. Why? Because it's a classic, it has the best cinematics...10/10.
Graphics (for when it was made) - 10/10
Gameplay - 10/10 (depends on your controller..., mine was MS Sidewinder).
Addictiveness - 9/10
Overall - 10/10
Make sure you do NOT skip the cinematics/chats...that is what gets you into the game. It'll occupy you for at least 15 hours...man, great game, period.
And yes, I have played (and beaten) Halo 1/2, HL2, Splinter Cell, etc...but MGS tops them.
It's a SOLID MASTERPIECE. Solid Snake, snake!!!
I can't get off this game without people telling me to. Now that I've beat it, I already have started on MGS2, which I hope is just as good.