>> I want the hardcore technical explanation of exactly why Doom 3 is possible only on the XBox and no other console. <<
Ok I had to do some searching. But here are some quotes from various sources.
>> "...John Carmack said that the Xbox is the only console platform that id is "completely committed" to releasing Doom III on. Carmack further commented that the Xbox version will have the "full graphics fidelity" of the PC version, which made a major debut at this year's E3, where it won a number of awards." <<
>> While commenting on the Xbox port of Doom 3, Carmack stated that PS2 would not be able to handle Doom 3 graphics without "sacrifices", while Xbox port will look just as good as the PC counterpart. <<
>> John Carmack, id's lead programmer, commented that out of the current generation of console's, the game's graphics engine would be best adapted to the Xbox <<
Also Doom 3 REQUIRES a GeForce 3 card minimum. Basically of all the articles I've read, the Xbox version will be comparable to the PC version, thus it is the only version. If they want to dumb down the graphics to PS2 level, yeah there might be PS2 & Gamecube ports. The Xbox port will look like the PC version of Doom3, just like the Xbox version of Half Life 2 will look like the PC version ( except on high end 3 Ghz plus ultra maxed out high levels ). It is kind of funny in that alot of Gamecube fanboys comment that the Xbox is a stripped down PC and then don't want to believe it will get the cutting edge PC games.
As for power. The Xbox IS the most powerful of all three consoles. Gamecube fans want to say they are close to Xbox BUT if you look at muliplatform games specifically ported to each console, the Xbox version ALWAYS looks better. It isn't the significant and MASSIVE difference between Xbox and PS2, but the Xbox version does definitely look better.