When did you try, and which genres? Out of all the 20+ games that I bought in the last two years, all of them were Gold or Platinum rank on ProtonDB. The only real issues these days are with anti-cheat stuff in competitive multiplayer games.
There are still big games with BE or EAC which either don't launch still, or will sometimes allow you to play offline on Linux but won't allow you to join servers with Proton. Some examples: PUBG, Dead by Daylight, Ubisoft games such as R6 and For Honor, and Destiny 2.
I used it for about 3 months for Monster Hunter World with some occasional visual bugs and artifacts, just had to tweak some settings to go from 3 FPS to 60 FPS (seemed to only use my GPU if I selected a particular DirectX version). One day a patch dropped and it went back to 3 FPS. Couldn't find a remedy, so I installed windows. No more visual bugs and artifacts and no more tweaking settings to play the game.
Ah I mostly play World of Warcraft and Guilty Gear Strive, both of which work almost flawlessly, in my experience, on Linux. I definitely understand frustrations around things just breaking when new content drops, that did happen to me when Shadowlands released but was resolved pretty quickly. I'm on a Mac now (for unrelated reasons) where WoW is native.
