Sorry I can't help, but if I could just ask; what was the Dreamcast version like (I did play it a long time ago, on my mate's Dreamcast, but can't remember much about it)? The PS2 version is dissapointing, not actually bad, but it lacks so many options and features, and it could (and should) have been so much better.
I hate playing games on PCs (Unreal Tournament is one of the few I still do, and that's partly due to the great mods for the PC version, and partly since the PS2 version isn't that good), I much prefer consoles.
Unreal Championship on the XBox was bad, it was a bad version of Unreal Tournament 2003 (or UT2003 was a better version of UC, whoever you listen to, but UT2003 itself wasn't nearly as good as UT99). Unreal Championship 2 on the XBox was very good, better than UT99 in some ways, but had enough faults to make me still much prefer UT99 (UC2 had some terrible new game modes, missed some of UT99's great game modes, had no speed control, you could only use two weapons per match (I HATE HATE HATE this!!!), some maps weren't much good, etc). I would recommend UC2 for the XBox, but it is very much a flawed gem.