MGS3 plays perfectly though there are instances with heavy special effects where the framerate slows down to a crawl. As far as I'm aware, these are only in cutscenes and usually when Volgin is on the screen blasting his lightning around.
SotC plays as it should. It's been a long time since I've played it but I don't remember any issues with the framerate. It looked amazing and was a pretty smooth experience.
The DMC games are pretty good if I remember rightly too, though I never did play the second game and made it only half way through the third.