[NeoVeles]

They have also said they would implement a rating system of how well proton will run various games. From 'Perfect' all the way down to 'unplayable'.

I think it was their quiet way of saying they couldn't meet the standard they set, at least, not yet.

[randomhodler84]

https://www.protondb.com/ has been around for a while and provides all of this. I consult it before buying titles.