I ran a little test game of Balatro to make sure games ran alright, and to my surprise everything seems good! (knock on wood) I always thought installing was going to be a lot more painful, but so far the worst part was backing everything up.
It can be hit or miss from game to game, check out protondb.com if you're ever having problems getting a game to work, sometimes there's small tweaks you need to do. Some stuff that uses anti cheat doesn't work as well, like Valorant or Fortnite.
I've been gaming on Linux primarily for years though and it's never been better.
Welcome