just wait for HL2 .

doom 3 is great from a technical standpoint, but it has that plasticky sheen that has eternally plagued CG, whereas HL2 lacks it. i think it blows you away more right when you see it because that look is associated with prerendered imagery (perfect bump-mapping etc.) and is very technically impressive, but hl2 is implementing little things like skin-shading models and realistic specular highlights on the eyes. now if only it would come out... *grumble*