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It was rough. I basically gave up on playing 3D games on Linux for the longest time and used a dualboot. Much less hassle.
What convinced me was when they verified Apex Legends, which was a game I was not expecting to be verified at all. Turns out Proton secretly got really good in all that time.
It's hit or miss. A gold rated game on protondb performed terrible when I used a keyboard and mouse. Everything was smooth, but looking around was studdery. Even worse, the game failed to properly capture my mouse, so I kept getting stopped when my "cursor" hit the edge of the screen. I literally could not look around.
the stutter has to do with mouse capture too.
on my side changing to exclusive fullscreen helps, hope it helps you too!
The developers, in their infinite wisdom, decided to not make that an option.
You can force it if you use gamescope, solved mouse issues for me in the past.