PCSX is still in developement. Even though its most advanced PS2 emu out there, it STILL DOES NOT PLAY GAMES! READ THE RULES AND FAQS!
Next beta (yet unreleased) shows a lot of progression in making games work, but they are still mostly unplayably slow (except 2d games) in all current computers. PS2 is real pain in the ass to emulate, so we can only wait till emulator is finished and we have powerfull enough computers to use it.