the macbook is sure hot. im playing games using bootcamp. and it does get really hot. but the system is just fine and stable. is it gonna be just fine?
as long as you don't cover up the vents I don't think it is a problem, off cause if the system starts shuting down while you're playing it's too hot, but otherwise I would think you're just fine!
when I play gridwars for 3 hours straight or starcraft all day, they both run through Rosetta so my MacBook gets pretty hot as well, and it hasn't crashed on me once yet...
but I'm no heat expert so I'm not 100% sure that I'm right...