In regards to PS3's melting, it would melt anyway regardless of firmware or game.
Look up every major PS3 release they ALL have forums topics about the PS3 going kaput while playing them.
Think about it like this:
Minor release (haze) played for 5 hours
Major release (GT5) played for 60 hours
What is it likely to die on?
Then there is the trolls
(Do the same with every major 360 release lol)
There has never been any solid evidence of a console failing directly based on which game it was running at the time.