I've been gaming on Linux exclusively for the last few years. Problems with games are few and far between these days.

I've only had to fully reinstall once every ~2 years or so, and it's usually due to some problem with my DE/system not booting that I can't be fucked to troubleshoot. That's mostly my fault for running GNOME on a rolling distro. I just back up my home dir to the storage drive and I'm back up and running in less than an hour. Other than that, it just continues to work and I can be reasonably assured that if I don't touch it, it'll be fine.