Hands up who has a machine capable of running Doom3 PROPERLY!Define properly.
Running it here on a P4 2.6Ghz 1GB ram, Parhelia 128Mb. At a res of 1024*768, ultra quality, (500Mb worth of textures) only "shadows" and AA are turned of. Works great here, 20 FPS when there are (several) monsters around.
/edit
Search some gaming forums on how to get DoomIII running.
like thisand
thisThat's enough offtopic ;-)