Retina Macbook Pro BootCamp vs Parallells Performance
BootCamp is usually between 3 and 4 times faster than either VMWare or Parallels. Bootcamp is the actual OS running on real hardware, where the other choices are running  inside the constraints of the host OS and must share resources (memory, cpu, etc...) with the host OS. BootCamp has full control of all of the system's resources.

It should be able to handle PC Games, although I'm not sure what screen resolution will be reported or what graphics card will be used. If the screen resolution is reported as the actual number of screen pixels, some of the in game text may be difficult to read.