I would guess its FPS related issue. With todays PCs ut2k4 having 85fps everywhere, and UT3 dropping in infights to how low? dont know the specs, but it would not be unusual if its dropping to 40-50fps, which has a significant impact on aim. Ever tried to play those FPS-style maps with 100fps+?What I don't get is the fact that I can hardly miss in UT2004 online with hitscans, but UT3 is just another story. Offline I didn't seemed to have any issue though.
Yawn.
Or maybe you used to play on 50+ tickrate servers, which makes everything more fluid. And now are playing on 30.