I'll just go by protondb.com and most what I want to play is either gold or platinum rated, or even native.
I only have 106 games in my library, and out of those 66 are native, 43 are gold or platinum and 1 is unrated. I've bought nearly all of then before even switching from Windows to Linux about nine months ago.
Using arch btw.
The server is based in Austria though.