From what I've seen, there are no bots and I would like to know why? Some of us HATE the online world due to cheaters, whiners, immature players, and unmoderated servers and would enjoy rather a fragfest with artificial players, as they (hardly) ever yell back. UT2003's bots are decent enough and provide hours of entertainment at a stretch, something I hardly get from playing online.
Why no bots??
I uninstalled Unreal II, btw, and had my roommate return it to EB and trade it in. It was practically unplayable at any decent framerates. Looking at walls wouldn't peak more than 36fps (2Ghz, GF3) and that's just wrong. The game was boring, slow, and uneventful as well.