I'm sure you could get Doom 3 running on the other systems, somehow. I mean if you started from the ground up, I don't see why PS2/Cube can't handle such visuals. Just look at GT4, Rogue Leader, or RE4. Certainly with a lot of extra effort, it could be done. It just makes more sense for an Xbox port.
Bleh either way, I don't find Doom 3 very fun.
Bleh either way, I don't find Doom 3 very fun.