Its not perfect, but its really damn good.

Just takes a little patience and research, mostly to find out if the type of games you generally play use invasive anticheat/drm or not, since those are the most likely to not run.

but I wont say protons perfect. I've had a few games with issues, some big, some small.. All usually get fixed with time, though, and now those games run great.

But in the interest of laying it all bare, I will say the 1 enduring issue I have is how janky it is to get Vortex to work for modding games, specifically Skyrim and Fallout 4.. but thats less a proton/linux issue, as it is a Vortex issue. Big strides would be made with a linux version, but Vortex is just jank in general, even on windows.

And To be clear, I say its jank. Not impossible. I modded the shit out of my Fallout 4 install just last night. but to do it I have to launch the game with STL, use that to launch vortex, the use vortex to launch F4SE.

edit I just discovered Mo2 linux installer, and oh my god its so much easier..can even download direct from nexus with the vortex download button.