This game kicks some serious ass. I was skeptical when reading about the type of immersive tension that Id software was trying to create, as their previous shooters have been more of the just run around and shoot **** variety. However, with this release, they've managed to create the same kind of player interaction as titles such as system shock 2, half-life, etc. This is truly the first game that has really put me on edge when playing, truly creepy stuff abound.
I'm running a P4 3.0Ghz machine with 1024MB Pc2700 Ram, and a radeon x800 pro. At 1280*1024 and high detail the game is very playable, but with the odd slowdown issue when multiple monsters are onscreen at once. I've read ATI is releasing a beta patch for this game, hopefully that'll coax a few more fps out of the game for ATI users such as myself.