System Shock 2

The Good
Atmosphere: you will fear the lonelyness, you will become paranoid as hell, and get really, really engaged in the game. With letters written in blood on the walls, alarms sounding, things exploding and falling appart without warning, dead bodies piled up everywhere, ghostly aperances forever re-experiencing their last moments of life, and distant screams and zombies mumbling in undead voices for you to come to them; either to kill them, or join them, or both. Even today, this game is has to be the scariest game ever made!

Story: At the heart of all the terror lies an engaging and evolving plot; something goes horribly wrong aboard mankinds first FTL inter-stellar starship, and the joruney of your dreams, has become your worst nightmare from hell.

Voice-acting: Will at times send chills down your spine.

Graphics: Similar to that Thief - not good, not bad, just in between; graphics is not really important in a game like this.

Gameplay: With sci-fi RPG-elements, a bit advanced but mostly easy interface, and several ways to complete different tasks: System Shock 2 is one of the better First Person Shooter / adventure games out there.

The Bad
At times TOO scary; but maybe that's a good thing?

The Bottom Line
This game is not for the weak of heart, but if you are looking for a good scare; look no further. This is quite possibly one of the best FPS-games ever made: better then Half-Life, better than doom, and unique even today.