>>723004052
Older games are easily playable. If you heard otherwise, it was because Windows shills who never touched Linux like to throw everything and see what sticks, e.g. this schizo babble over here >>723001093 in addition to all the conflicting claims of what Linux supposedly can and can't do.
>It only runs popular games!
>It only runs indie games!
>It only runs new games!
>It only runs old games!
All bullshit. The only categorical statement you can make is that it's less likely to work with online games, specifically those which rely on anti-cheat middleware that either blocks Linux outright or needs to check things that Linux won't allow. A number of single-player games also don't work for various reasons, invariably related either to proprietary video codecs or bad development practices i.e. using Windows API hacks too obscure to be implemented in Wine, but it's not just the old games or just the new games or anything like that.
There's no reliable data on what percentage, because ProtonDB only lists Steam games and a ton of those games don't have any sufficiently recent reports while WineHQ AppDB is practically dead so the few reports there are even less likely to be up-to-date, not to mention ProtonDB's method of coming up with average ratings is highly questionable at best. You'll just have to look up some games you like and read the recent reports to see how compatible they are.

GNU Gaming thread