Last night I sat down for a 3 hour session in Guild Wars 2 on my rMBP. I'm using bootcamp windows 7 with the current drivers, including the most up do date gfx driver from the nvidia site. I have the settings cranked up pretty high, so during gameplay the fans are on full pelt and the keyboard seems to be close to melting. The battery started off at full, and I had the machine plugged into the charger the entire time, but I found when I finished playing the battery was nearly empty. I am certain the charger never came out and left the slot the entire time. Is the rMBP unable to charge fast enough to cope when it is under full load? If so this is a hideous design flaw, and makes this machine simply not fit for purpose if you have no choice but to shut down after a period of running the thing at max load? I will test again later and see if it is a continual problem, but just wanted to see if anyone is experiencing this also.