I actually disagree... as a bot game, I think it's pretty fantastic. It works well in that regard, even if that isn't ideal.
I'd be interested in an expansion. I play the game little now just because everyone online is too fucking good at it and I'm not (I played a lot more Quake stuff, so I'm far better at those), but I'd love to get those old game types back. Or even just a shitload of new maps. Half the fun I had with the game was just gawking at how pretty the maps were.
I really have lost a lot of faith in Epic. They used to be a favorite of mine, but they rocketed toward the bottom ever since Gears, which wasn't a bad game, but wasn't what it should have been in hindsight, and they don't seem to have learned any lessons from it. Then Cliffy ran his mouth, and now I just wish I could sock him in his arrogant fucking face. I did enjoy UT3, but everything else surrounding the group is just dismal now. I don't even have any desire to play Gears 2 despite liking the first. I just don't care.