Thus far, 92% of games have ran flawlessly for me on Fedora (4 failures in the last 50). The main issues have been related to games that have kernel mode drivers for copy protection or other exotic types of anti-cheat. Perhaps most amazing (to me anyway) is the fact that mods and workshop items work perfectly. In most cases, I could pop open a saved game and continue on Linux, custom mods included.
Performance-wise, I haven't noticed a difference but I generally run very modern hardware which works better with the DirectX to Vulcan implementation. I also swapped to an AMD chip/gpu when moving to Linux and I think that removed the headaches that people often have with Nvidia drivers. Overall, it's been fantastic.