Honestly, recent Macs are running contemporary titles more than well enough. Not everyone cares about turning the graphics sliders up. On Windows or otherwise. I've been playing Deus Ex: Mankind Divided just fine lately, and Overwatch works well if I boot Windows, for example. Most MMOs and popular "e-sports titles" (pretty much the core of PC gaming, by numbers) like Counter-Strike, the MOBAs and such are all there on the Mac side.

Most AAA games are designed with the trash hardware of consoles in mind, so laptops with more powerful GPUs handle them just fine. Apple's desktop offerings are abominable in terms of value and sticker price, but they pretty much own the non-Walmart-quality laptop market...