I switched to Linux Mint like a month ago and Inhad no problems at all. Valve pushes Linux a lot since the Steamdeck. Had not a single problem with a game. I even played Itch.io games. Just set the compatability options to proton and most stuff will run fine. Online Multiplayer games do make problems though. They have kernel based anti cheat and that is not supported. If you are unsure check this website for the games you play: https://www.protondb.com/