It's graphics hold up and you don't need a new system to run it well. I recall tricky boss mobs, very nice creepy sound track and wonderful overall atmosphere, play with the lights out if you dare! Lots of difficulty if you want it and includes an expansion, great game, highly recommended! My other favorites include Unreal Tournament (first one) and Doom II for their crazy replay value with all the custom maps that were out there at the time.
