I understand that the new F/A-18OIR has no campaign, just single missions. Does PSF have a campaign? Are PSF graphics comperable to JF18?

Neither PSF or OIF have a campaign. There are just single missions and a mission builder for building more.

The graphics of PSF predate JF/A-18 by a couple of years. PSF is a "rerelease" of Graphsims F/A-18 Korea which came out just as 3Dfx was making it into the scene.

OIF is a revised version of F/A-18 Hornet 3.0 but with a completely different user interface and some improvements in graphics. I haven't flown it enough yet to see if the major bugs that haunted the previous versions have been fixed, or addressed.

Neither is a "hard-core" simulation but both are fun to fly. They will not compare to LOMAC when it gets released.

IMHO, I prefer JF/A-18 graphics after being altered with some of the user modifications.

I love the OIF terrain. It really kicks as and looks fantastic in a dogfight up in the wild blue yonder. Janes terrain is ugly as you an get. I never liked the visuals in Janes games, don't know why. And all Janes games have a porked engine which always runs crappy.