Nothing made Ut3 enjoyable for me, at least in multiplayer. And I played the Campaign and a bit of Instant Action on casual just because I'm not motivated to even try. UT3 is a "bored to death and nothing to play" game to me. A last resort, so to speak.
The original I can play for days without stopping... Well, I used to, now I'm lucky if I squeeze out more than 4 hours at a time lol