Unfortunately rMBP is not meant for gaming. Don't get me wrong, it's very powerful, has great gfx (overclocked 650M with GDDR5 runs better than most 660M GTX on the market) and I've been playing most of my games (WoW, SC2, Diablo 3) max detailed on external 1920x1200, but it will overheat like hell.
That is the main problem with this machine. I also bought it with gaming in mind, but after having it around for 8+ my opinion is clear: if you want a decent gaming hardware, get either Alienware laptop or build your own rig (as I did).
For example, playing WoW for 30+ minutes makes my machine to throttle both CPU (it stays at ~1.4Ghz) and GPU. So paying that much for a hardware running half the speed was bad idea, I will be switching to 13" for mobile usage probably and put some cheap microATX rig at my office / home with GF 660 GTX / i3 jusr for gaming.
That is the main problem with this machine. I also bought it with gaming in mind, but after having it around for 8+ my opinion is clear: if you want a decent gaming hardware, get either Alienware laptop or build your own rig (as I did).
For example, playing WoW for 30+ minutes makes my machine to throttle both CPU (it stays at ~1.4Ghz) and GPU. So paying that much for a hardware running half the speed was bad idea, I will be switching to 13" for mobile usage probably and put some cheap microATX rig at my office / home with GF 660 GTX / i3 jusr for gaming.