MGS crashes every 15 odd minutes. The system locks up and stops working.
I haven't actually tried DMC3 specifically, but I did start another playthrough of DMC3:SE prior to DMC4s release on my 60gb. I was playing as Vergil - all going well until I hit Mission 18 where you have to fight all the bosses again. The problem? Only two of the bossfights load. The rest refuse to start, meaning it's not possible to pass the mission. I got pretty frustrated and started a playthrough as Dante. Got to Mission 18 - same thing again.
Interestingly, according to Sony's
BC Games site, DMC3 and DMC3:SE have no known issues, which isn't the case at all (I'd like to note, I did try to e-mail Sony about the DMC3:SE issue - no reply to any of my e-mails). MGS3 isn't even listed on the BC site, but subsistence apparently has "noticable issues".
So not cool.