I think of it like this: Doom3 uses an engine that is revolutionary, somewhat like when Disney started using computers to animate their films (ie Monsters Inc, Toy Story, etc). People loved the animation so much that nowadays they disregard the older, more paint-palette directed movies like Beauty and the Beast, Aladdin, and The Lion King. The point I am trying to make is that the Doom3 engine will revolutionize the entire computer industry, just as the Quake engine revolutionized FPS games. Half Life 2 I admit has its points of true eye candy like water and particle effects, but lets face it, more and more people are growing accustomed to games looking as real as possible, with gameplay still intact of course. I had the chance to meet John Carmack at an LA "Race to Space" convention (he does have another hobby besides developing software for ID) and had the chance to ask him about the Doom3 engine. He simply told me EXACTLY what I am relaying to you guys. Of course, that was in my senior year in high school but still, Doom3, PS 3.0, etc etc will be the next generation.