Balls@ck, I've been playing UT2003 since the demo originally came out, then brought the game as soon as it was released. Other than having my jumps cut annoyingly short by door static meshes (which isn't really a bug, it's the way the levels are designed), I've never found any bugs in the maps. If I can play without noticing any bugs, I'm sure you can play perfectly well without problems.
Balls@ck, name the 6 bugs you have noticed in 5 minutes :D
I didn't find anything wrong with the bugs. They all seemed like perfectly good bugs to me. :)