It's the same in windows, when i'm playing Microsoft Flight Simulator X with graphics all set to high. It'll get as hot as 90 degrees.
Actually if you ask me, how effective is the cooling on the MBP, i wont be surprised if you say it suck. Some more, everything inside is pack so close together. You cant expect it to cool as well don't you ?? ( there is a reason why desktop CPU/GPU heatsink is so big. Now a days, people even use water cooling system to cool their CPU/GPU !! )
It's a give and take from my point of view. If u want thin/slim/beautiful, cooling will suck. If you want better cooling, your laptop will be bigger/thicker/ugly...
In this world, you can only choose one... You can't have best of both world.
We just got to live with it.