PS2 is kinda super fucking hard to run smoothly. I never got to run Black fine. Man, I really wanted to play that game with mouse and keyboard.
The truth has been spoken. I could never get a smooth running PS2 game. Usually with PCSX2, you have to pingaz a bunch of files and plugins just to get it to work. After that, it usually crashes if you try to run from your dvd drive, making you have to burn a 6gb ISO file to your PC to run it there, to even then have the game to run shitty.
I've tried it with Grand Turismo 4, Hitman 2, GTA:SA, Sly Cooper 2, and Ratchet and Clank. Yet the gamecube emulators run pretty smooth.