It's really quite good. When I browse the steam store I tend to just assume that anything with a windows flag will at least be functional.

If I'm purchasing a game that I plan to play exclusively on linux, I still tend to check proton DB before I click buy, but it's becoming more and more of an after-thought.

I ended up playing Elden ring on Linux rather than windows as it seemed to stutter a little. Hard to believe how far gaming on Linux has come.

Night and fucking day, my friend.

Proton support is scarily decent now, Linux daily driver is reasonably feasible even for games, though you might run into some grief with EAC if you play MP titles.

Yup. If it’s in Steam it just works. I play mostly shooters. I’ve been playing Tiny Tina’s Wonderlands (Borderlands game) and it’s been glorious.

The first 50 minutes of Tiny Tina's Wonderlands (Borderlands) on Linux and Review https://youtu.be/T_3sCcQksKQ

You can check https://www.protondb.com/ for game compatibility.

It's gotten pretty good the last couple years, and it's improving at a very fast pace. Some games work flawlessly on the Steam Deck, but don't yet work for me in Steam on my desktop running Arch, though.