First up, let's talk about the vast range of equipment you've got. Another aspect of Metal Gear Solid which the previews largely missed is the boss characters. These take the form of superbly atmospheric set pieces. For example, there's one point in the game where Snake finds a corridor full of dead guards. A cut scene shows a guard staggering around a corner and then dying.
Further investigation reveals a room where a cyborg Ninja is threatening a young man.
You've briefly seen this guy already. He's one tough customer. He moves like lightening and can turn invisible. In case these memories and the corridor full of dead guards hasn't already promoted you into being a bit worried, the young man wets himself when faced with the Ninja. An impressive build up which leads to a major clash with the cyborg.