for those of you who have both (im dling AA3 right now on steam ) 3 categories-sub-categories graphics-models and animations (standing and walking/running) gameplay-realism and overall fun-ness sound-the sound of the gun and sound "physics" you can call it (if a gun is fired from behind a door it sounds like its been fired behind a door, not in front of you)
I believe the sound factor is very important in UrT, it's designed well so that you can hear footsteps behind you, the shutter of a door opening, or a gunshot fired far away etc. One of the most important aspects you need to get good at to become a better player. Although it's based on the Quake engine, you shouldn't blame it :s