Well, I should have worded that better, shouldn't have been so dismissive. By 'serious' I meant 'resource intensive'. I don't know all of those games, bit the games I do know are definitely not very taxing on a GPU (aside from Skyrim, but what settings are yo uplaying it at? Does that seem worth it for the price tag?)
I don't think you'd argue that a mac is a good gaming rig from a performance / $ perspective (or any other perspective really).
http://steamcommunity.com/profiles/76561197998185123/games/?...
The Elder Scrolls V: Skyrim Special Edition: Win
Team Fortress 2: Win/Mac/Lin
Factorio: Win/Mac/Lin
Rocket League: Win/Mac/Lin
Particle Fleet: Emergence: Win/Mac/Lin
SHENZHEN I/O: Win/Mac/Linux
Oil Rush: Win/Mac/Linux
Castle Crashers: Win/Mac
Tropico 5: Win/Mac/Linux
Literally every game I've played recently except ONE supports Mac
Obviously I'm not a "serious" gamer :)