Oh yeah you guys know doom III will have multiplayer dont you? <--technically yes, but ATM limited to 4 players who can only join when a level starts its rotation. it's not your standard hop on a server and play kinda thing.. read some reviews please.
minimum specs for doom 3 are supposedly >1 ghz and a gf1. even carmack has said that.. since doom3 was based around those cards. although of course those are only the min specs for the game, and we all know we want more then the minumin
not to mention the id software CEO said carmack capped the fps at 60, since it's not supposed to be a real tweak-for-fps (q3'ish) style game. it's supposed to be scary and suspenseful.
as far doom 3. it's really hard to say. it's slated for around march of 2003 but things will more then likely get delayed. UT or q3.. it's really a preference in the area in what you like.
Quake 3 for example is on an alien world where nothing looks real or normal. <--uh.. right. whatever you say. Unreal 1 IS literlally a planet somewhere with aliens and monsters.
in all actuallity q3/ut have no setting as to place, time, or location. it's simply wherever the mapper chooses to put them since there is no story line.