I'm about 2 hours into this game, and here are my first impressions. One, it's pretty and all, but the real story is how ABSOLUTELY SCARY this game is. The sound is phenomenal. Also, you can have your gun or your light out, not both at once. The levels are amazingly detailed. No two hallways look totally alike. And the lighting.... You have to see the game in action to appreciate dynamic lighting like this. The screens don't do it justice. As far as being playable on systems: My gaming pc has an athlon 64-bit @ 2Ghz, 1 GB crucial pc3200, and an ATI radeon X800 Pro w/ 256 GDDR3. This game brings my rig to a crawl at ultra settings. I can play at 1024 with ultra settings w/ a decent fps number (~30). At 800 w/ ultra I get more like ~45. With AA turned on, the fps rates drop considerably. So it looks cool, is fun to play, sounds great, and you'll need a G5 cluster with 80 gigs of RAM and 10 nvidia 6800's to see all Doom 3 can do. Not really, but if you're not sure if you can run it at high detail, you can't. I give it a 9.5/10!!! Great work id!!