Not REALLY slow... I'm able to run Soldier of Fortune 2 at 1024x768 with all details set to max and 4XAA and 8XAF without my FPS dropping below 85, which I have locked it at because that's what my refresh rate is.
I haven't done any measurements in BF1942 yet... but I assume the same will be true... although I will only be running 2XAA in that game due to 4X scrambling the text to the point that it's unreadable, and chatting with others online while playing is half the fun =)
I'd tell you a little about FS2004 performance, but there are so many things to customize in that game that it would take too much time to list every setting. But long story short, details are set at about 75% of max, with 8XAF, Tri-linear filtering, and the game enabled AA, which looks like 2X to me. (setting 4X in the drivers causes certain portions of menus not to show up for some reason)
Hmmm, what else... oh yeah... I run Morrowind at 4XAA, 8XAF at 1024x768 with all details set to max and get 40+ fps depending on what I'm looking at.
Rainbow Six 3: Raven Shield runs at 60 FPS with 4XAA and 8XAF at the same resolution with all details set to max.
Combat Flight Simulator 2: WWII Pacific Theater runs at over 85 fps... (I've never seen it drop below 85, even with lots of enemy aircraft on the screen) and goes up to 120 when I'm flying over open ocean by myself.
Oh yeah... and CS NEVER drops below 85 FPS, which I have locked it at again due to my refresh rate... even with 2 smoke bombs on the screen and 7-8 other players.
Hmmm, that's about all the game testing I've done so far. I don't have UT2k3 or I would run those benchmarks... I may pick it up soon though, we'll see after this months bills =)