I agree, but the ratings are self-selected by the reviewers so it's hard to enforce. The more the reviewer is comfortable in the linux/steam/proton ecosystem,

I agree, but the ratings are self-selected by the reviewers so it's hard to enforce. The more the reviewer is comfortable in the linux/steam/proton ecosystem, the more inflated the ratings get. I'm guilty of this myself, rating a game platinum because it runs great perfect except for multiplayer (which I don't want) and only if you give it this esoteric launch command (which I had to do once and promptly forgot about). If I'm lucky I remember to add those caveats and what the esoteric launch command was. I'm usually just so happy that I can run the game now after decades of a terrible linux gaming experience that I can't help but over-inflate the ratings.