I just tried Gran Turismo 3 with Gigaherz's CDVD 0.7 plugin and it works. My CD is pretty scratched though so it was running like crap on the intro. Why don't you make an ISO image of it with Imgburn and then mount that image with Daemon Tools and run it like that if you want to use this plugin? Or lese use Linuz Iso plugin and just run it from the image created. I don't have God of War to test for you.
Make sure you click on file -> Run CD/DVD to run the games from your CD drive.
well the game wasnt mine so i didnt feel right to copy the iso (its my roommates) and yesterday i just moved back home and my brother "cant seem to find" any of my ps2 games. Im planning on buying kingdom hearts 2 and i hope that works if not ill have to dig up the ps2 itself D-;