This is what I think made UT1 more sucessful than UT2k3.
The first thing is Player model scaling/animations. UT1 had the models scaled perfect, it made the game feel more solid than ut2k3. It made blowing someones head off with the sniper rifle twice as good. There is also a couple of problems with player animations in UT2k3. They could have put holding the weapon with one hand while strafing (which made good players have good style in UT1), but instead they chose the quake3 crap with holding the weapons with both hands the whole time (feels like u get killed by a n00b everytime u die). Ut2k3 player models are unproportional to the maps and this needs to be fixed.
Here is a comparison of strafing in UT1 and UT2k3. Also notice they dont take baby steps in UT1. They also flex at the knee a little bit when running.
holding with 1 hand, and looks like hes running with bigger steps.
player model too small, baby steps, and holding with 2 hands. Not near as good as UT1 animations.
The next thing is the maps. Almost all of the maps in UT1 had good gameplay and flow. Face3 is too big, and geothermal is too small. But I really hope they are going to have good maps in UT2004.
if you havnt played UT1 in a while try it and see how much more fun it is