Personally, I love the normal mapping. When used properly it gives the 3D world a tangible feeling that cannot be matched no matter how many polygons you use (although it doesn't appear to me that Doom 3 is that low poly). Personally, I think UT (although potentially more detailed in terms of polygons) looks very flat while Doom 3 looks like you could touch it ... every little nook and cranny looks like it would have a feeling to your hand instead of just being flat.