Ryzen 5 5600 still good enough for gaming?

yeah, comfortably for most stuff. six cores and twelve threads is still plenty for current games, and at 1440p or above the graphics card is doing the heavy lifting anyway. where it starts to show is high refresh 1080p in competitive shooters with a really high end card - the cpu becomes the cap there. if you ever hit that, the nice thing about being on AM4 is the 5700X3D drops straight into the same board with the same ram, no rebuild.