It’s fantastic. I’ve been 100% Linux for gaming for 2 years now.
A favorite story of mine is the Elden Ring release. On Linux, the PC version didn’t have the microstutters it had on Windows, and it was entirely due to shader precaching on Steam/Proton. There are other times where performance is better on Linux also (and this is for Windows versions of games), not the least of which being lower overhead.
Mind you, nvidia does still lead to some driver issues for some. AMD is kind of where you want to be for easy Linux gaming.