I have a 2011 Macbook that I run WoW and some Steam games on. While my temps never ran than hot while playing, what I would suggest doing is downloading smcFanControl so that you can up the power of your fans while playing games and then set them back at their default when you're done. I do that when playing WoW and I never go over 71 degrees Celsius (I'm usually around 54 degrees C when playing now.)
Also, when in wow, type " /console max fps 30 " (without the quotation marks) to keep your framerates around 30. This can reduce heat significantly.