Antialiasing causes very undesireable effects on image quality. It appears to be some form of temporal AA and it causes very odd shifting/blurring of objects in motion. This is especially apparent in optics, both magnified and unmagnified.
I have had to turn AA down to low(off) due to this.
It may be hard to see but in motion, AA destroys the reticle, the pixels shift all over. It even seems to add a motion blur effect to scopes.