I've been searching Google for a solution to my problem and it seems like it's pretty common and nobody really has a fix, but I thought I'd try anyway.
I have an NTSC ISO and a PAL ISO and they both have this graphical problem where your character will have patches of random game textures on his model the dirtier he gets. I know it's related to his filth level because jumping in the lake and shaking off fixes the problem for a short time, but it's really annoying and distracting nonetheless.
Apparently this game has a history of not working right since at least 0.9.6 of PCSX2, and the texture glitching used to be a lot worse. I'm currently using 1.1.0 (latest build) and haven't had any problems with any other game.
Another problem I can't get around is the fluctuating framerate. This is the only game that causes it (My computer is capable of running Gamecube/Wii games just fine as well as other PS2 games) and no matter what my settings are, there is never a noticeable speedup.
I realize this is a problem ISO that has lasted for many years but I'd really like to be able to play it again after so many years.
My PCSX2 version is 1.1.0
System specs:
http://i.imgur.com/qhNMuYl.png
I hope I was descriptive enough.