I am having similar issue, but I am not a gamer.
My MBP, 2011, is having some random freezes, kernel panics, and program malfunction such as Terminal not executing any more commands and etc..
I doubt it's a temperature issue as the fan is not even spinning when these things happen.
I've been using older MBP (3 years old) without much issue, but this new MBP which I was highly anticipated, seemed to be really out of shape when it comes to stability.
Anyone else?