I hugely disagree with that. While there still might be pixelation to some degree with AA on, without AA the pixelation is immense (on most games) and edges are very jaggedy.
Also, the pixel density of your monitor can factor in too.
Nvidia cards typically aren't as good with AA as the ATi 4 series, and you'll see some framerate drop depending on the game. In a high end game like FC2 you'll notice some drop, but 47 fps average should be fine.
Um? I'm going to have to disagree there, have you ever played TF2 with AA off and set to the max? It looks like a completely different game. You must have like a 12 inch monitor or something to not be able to tell the difference.