MASSIVE problems. Especially on Wayland. Even more with a GPU that can't keep up (Where FSR saves my ass, actually). But I'm used to the flickering and stuff now, and good story games (Like Metro Exodus) are optimized while looking fantastic.
This is so cool. I switched to Linux and once a game runs performance is or at least feels comparable to Windows. With stuff like this improving it even further (and Gamescope, etc.) you can probably get a better experience gaming on Linux compared to Windows in some scenarios.