look at these screens of the 360 version:
http://www.gamersyde.com/news_5279_en.htmlthat's pretty weird. might be a style decision that somehow in motion it looks good without AA (no I can not remember any case of this) but they definitely should be able to include it considering these are the min requirements of the PC version:
Team Fortress 2 Recommended System Requirements
CPU: 2.4 GHz Processor
RAM: 512 MB
Graphics Card: DirectX 9 capable graphics card 256 MB
Windows 2000/XP/ME/98
Mouse
Keyboard
Internet Connection
CD or DVD rom drive
Team Fortress 2 Ideal System Requirements
(For running the game smooth in 1280x1024 with High Quality graphics)CPU: 3.4 GHz Processor
RAM: 1024 MB
Graphics Card: Radeon X800 or Geforce 6800Windows 2000/XP/ME/98
Mouse
Keyboard
Internet Connection
CD or DVD rom drive
does the PC version have an AA option? I can't think of any hardware reason for the console versions to not have AA (especially with the low PC requirements) if the PC version has it.