I agree with GOREGRINDER, that AF should be mandatory. Not only is it evident immediately, it results in a smaller performance hit. How many of you sit there and measure jaggies at 1280x1024 in a FPS? I could see how it would be more important in an action game or somewhere where the pace is slow. In COD2, do you really have the time to complain that the cables aren't perfectly straight? I played HL2 on RAdeon 8500 at 800x600 noAA/noAF and still enjoyed the game vastly.
The point is, if you want to play COD2 or powerful games, even on a regular TV, and only have $400 US to spend, you get a console. If you want the best looking setup, please feel free to spend $1400 on 2xR580 cards in 2 weeks and no doubt it'll smoke Xbox360 at 2048x1536 4AA/16AF. At the end, money has a large impact on opinion. Even if Xbox360 doesn't look as good, does spending 2G on a PC make the game look 1.5 grand better than xbox360? We all talk about bang for the buck when we buy new PC rigs, why can't we talk about bang for the buck in this discussion? My P4 3.2ghz and Radeon 8500 and 1 gig of ram system couldn't play doom 3 smoothly for the life of it and sure cost a lot more than inferior Xbox when I bought it in 2003.