If you're used to fast standard-UT-style-gameplay, you should know that DXMP is VERY slow, so you will have to get used to it. I only played it a few times, and it seemed to me that the rocket launcher is the strongest weapon (but maybe I was wrong, maybe it's just that everyone takes it 'cause they're used to rocket launchers from Quake and UT etc.), but I guess DXMP can be interesting too 'cause you need more tactics there. Or, at least you have to chose your strengths after spawning. Just try it, maybe you'll like it, it's just very different from UT in terms of map size, speed etc.
Bots: There are bots you can d/l at
http://teamuc.deus-ex.org/ or somehwere in the downloads section of
www.deusexcenter.com (the difference is that you get it zipped here, and with a readme with the installation instructions you can see on Team UC's site). They aren't too useful tho; I didn't try them yet, you have to put them into the map yourself with Ued, and from what I've read they don't do a lot more than just shoot back.