SC2, PUBG, the new in-progress Unreal Tournament etc. work fine, even on midrange 2015 hardware. You'll get about 55FPS on 2k resolution. Basically, as long as

SC2, PUBG, the new in-progress Unreal Tournament etc. work fine, even on midrange 2015 hardware. You'll get about 55FPS on 2k resolution. Basically, as long as you get a recent GPU, any reasonable i5 or better machine gets game-ready. Steam, Origin and Epic games all work with it out of the box. And you can if needed reboot to windows and use it as a game-OS for unported games. Cost-wise, it's a no-brainer for when you enjoy macOS and portable computing, adding a PCIe-TB3 box and a GPU is well below the cost of a dedicated gaming PC. If you wanted a single fixed system, a dedicated PC would be the more economical choice, but economics aren't always the endgame. Especially if you simply enjoy macOS and don't care for hackintosh setups; it leaves you with few options for hardware and this is a nice solution.