It’s pretty good for single player games on Steam but a lot of multiplayer games use anti-cheat that doesn’t work on Linux, and some launchers don’t work well. And of course if you use Game Pass for PC you’re out of luck entirely. Most VR headsets also won’t work on Linux.
So it really depends what kind of games you play. It’s kind of similar to the Adobe situation. I suspect most gamers will have at least one deal-breaker that forces them to keep at least a dual-boot around. But many people could use Linux most of the time, including for games, and that’s already pretty exciting for Linux fans.