Far to late for a mod when 99% of the AS community moved on after the disastrous release.Last I heard a mod version was released. Seriously, if a gametype is wanted back badly enough, it will find its way back via mods and mutators. There's no excuse.
Also, for people saying the AI is dumber than in UT2k4, there's no way. They might be the same in both games on the same gametype, but they REALLY improved the intelligence in Warfare compared to how they acted in Onslaught. In VCTF, though, the bots in UT3 had a tendency to hop on a hoverboard and just sit there, but that mainly happened only on custom maps.
Also, if UT3's AI really isn't smart enough for you, you can use Mapmixer to modify the bot to act VERY similar to a human player, such as upping the strafing, dodging, and jumping frequency to make the bot less predictable, increasing the accuracy and reaction time to make him more formidable, even adjusting his combat style so that he could either choose to stop and camp with a sniper or head directly for the action. All someone needs to do is release a mutator to change these values according to the situation (such as upping Dodging when going against a spammy player, decreasing accuracy when he turns too quickly, lowering reaction time when nothing happens for a long time, etc. etc.) and you will have a nearly human-like bot I bet.
Last I played the campaign, i dreaded WAR maps because I knew the bots would steal the Orb. Unfortunately, the Orb is very much needed in single player. On that note, the orb made War far worse than ONS
As for map mixer, i don't think a mod should be required for a game to be fun to play.
PS
I have UT3 installed through Steam. I will try it again, but I am sure it will let me down again.