Right, antialiasing is for playing at lower resolutions where jaggies are far more pronounced. I don't bother with AA at 1920x1200 either, even though my system is more than capable of handling it, simply because it serves no purpose. If you're capable of noticing jaggies at that resolution, then you need to stop staring at a motionless character, put your hands back on the mouse and keyboard, and actually play the damned game.
That wasn't my point though. Crank everything else up and try playing it on a system from three years ago. Tell me how that goes if you want, though I have a pretty good idea how that'd go since I did that with Crysis back on my Athlon 64 X2 from 1-2 years ago.
And as for Crysis' gameplay value, I beat it in eight hours and never looked back. It's a benchmarking tool that generates interactive Scenery Porn. I prefer my games to have actual substance to them, even if the graphics are sub-par with Crysis in mind.
