I've spent countless hours playing a game called Romance of the Three Kingdoms XI with PUK, which comes with its own DRM (non-Steam). Despite its availability on Steam, I'm hesitant to buy it again for the same experience, especially since it doesn't run on Linux.

Another game I enjoy, Dead by Daylight on Steam, consistently runs into issues such as severe memory leaks, unresponsive spacebar after alt-tabbing, random freezes, and occasional stutters no matter what troubleshooting I attempt.

Lastly, my wife and I frequently play Fall Guys. While it's mostly audio-related, there are occasional random disconnects that never happen on Windows, which can be frustrating for a game meant for casual enjoyment