While it's true I haven't personally tried more than about a dozen of my games I will point out that 1) that covers a wide swath of genres, publishers, and game engines, and 2) I ran my entire library of several thousand games through protondb before hand to have some idea of what I was in for and out of all those thousands less than 10 reported as not functioning. Of the ones that wouldn't work most actually can run, but the publishers are banning people who play under Linux. The most notable from that list would be Destiny 2 and GTA 5. So yes greater than 90% of all games run fine in Linux these days either straight out of the box or with simple configuration tweaks.