Playing AAA titles might be difficult if they're badly optimised/don't have low graphics options. Others, like Skyrim, can run on an 2011 Macbook Air if you put the settings to low(though it leaves you with a surprisingly boring experience once the "HOLY CRAP MOUNTAINS!" is taken out of the equation).

If you're into indie games/GoG oldies it makes literally 0 difference what hardware you run most of them on as long as they actually run on that OS.