I have a random suggestion, feel free to ignore:
I have an old beat up 2010 Macbook that I installed Windows on so I can actually play games! :P So to other gamers that only have a mac, I highly recommend creating a partition (Boot Camp). If you haven't heard of it, basically that means you keep your regular mac operating system and can use that as normal (for web browsing or whatever) Buuuut, you also have the ability to switch to Windows whenever you want to download/play pc games. (You just choose whether you want to boot up into OS X or Windows whenever you power on your computer) It took me a few tries to set it all up correctly, but it was well worth it.