I've been debating making the switch for a long time, but after spending like a week researching Proton, Lutris etc. on Linux, I decided to try it out and nuked my entire Windows 11 drive. :)
So far, every game I threw at it works perfectly fine, including Elden Ring & Cyberpunk.
I had to spend a little time troubleshooting some small issues but it's part of the fun!
Specs are in the neofetch, my compositor / WM is Wayfire (Wayland) :)
It depends and I'm not going to sugarcoat it.
You can look up the ProtonDB pages for the games you plan to play, and see how they fare. Some will work out of the box, some will require some tweaks, some will require MAJOR tweaks (I've yet to encounter any of those), and some will just flat out not run.
So far, the most "configuration" I've had to make was changing the Proton version used by same games. Example: Cult of the Lamb has major issues on the latest Experimental build of Proton, but on 7.0-6, it runs perfectly.
It depends if you're ready to spend a bit of time on getting bigger games working.
As an addition to what he said. Some game will not work no matter what you do mainly because of anti-cheats. Some examples would be R6S, Destiny 2, any recent COD game, the site AreWeAntiCheatYet shows that list.