SH3 for the PS2 has none of these issues but the HD version does. Textures pop in and out and the audio goes from 5.1 to stereo randomly at times. I've even had it where the fog goes away and the video noise goes away as well. They are both terribly glitchy.. As for SH2, I have the PS2 version and have not had these issues, but the ports have them.. I find it hard that these ports run so badly on the PS3 since the system is so much more powerful than the PS2 was.
I just dusted off my PS2 and played Silent Hill 4, which I like the most out of all the games, well not more than the first game. I even played The Thing, Cold Fear, Extermination, The Suffering, Return to Castle Wolfenstein (xbox), among others..
I recent'y picked up Clive Barkers Undying and I love it a lot! Quite spooky it is.