The problem is, the games I usually go for are on Steam and don't seem to be available for Macos.
FYI, just some of my Steam games on MacOS:
- Rocket League
- BattleTech
- Civ VI
- Stellaris
- Shadowrun series
- Chivalry
- Witcher series
- Portal series
- Bioshock series
- Bloodbowl
I don't know what your tastes are, but there is a pretty wide selection of FPS, RPGs, Sports, RTS, and Puzzlers out there. Yes, some are older, and I'm never going to say a MB is a great game computer, but there is a lot to play.
And, as a bonus FYI, SteelSeries' engine is available on Mac so you can have a gaming set-up if you want. Mine: