Have any of you tried Galtanor's Invasion for UT3? It's an absolute blast! The latest version, 019, is compatible with the last 1.3 patch. The monsters in there are very well textured, the animations I believe are using the same ones from the official characters so it looks professional already and it's just in beta form as it is. With manual configuration it's possible to add bosses, numbers of them each waves, the overall difficulty, the types of monsters to be spawned, etc, it makes me remember the Monster Madness server I used to play in UT2004 (although MM is much more complex and has a lot more variety due simply to the time they've had to work on it since UT2004 has been released years ago, of course, but UT3's Invasion has a lot of potential).
Anyways, if any of you are disappointed by other game-play modes in UT3 but you still own the game and it's taking up the dust then I highly suggest you guys at least give a try to that mod, and there are two official servers for on-line play, although I prefer off-line play myself since I prefer to configure my monster waves myself for my own skills during game-play, and I also use UTRPG which adds an RPG feel to it with progressive leveling and even power ups dropped from the monsters when they die and so on, also powered-up weapons with different effects like knock back or increased or even reduced damage, etc. I really enjoy it, I find myself playing UT3's beta Invasion more than the much more developed Invasion for the UT2004 community, simply because it plays better, it has a more frantic feel to it maybe because UT3 is more similar to UT99 than UT2004, which in my book is a plus.