Personally I haven’t. While Linux is imperfect, choosing the right distro makes the rest of the experience straightforward. And with it’s whole complexity, I find Linux more user friendly than Windows. Even driver issues, broken shadow file ownership and KDE specifics only made me more confident about my choice to use Linux after I solved everything.
Specifically with the Cinnamon Panel (taskbar) on Linux Mint during fullscreen gaming. I like to tab out during long matchmaking and under Windows the taskbar would be visible and usable when another window gets focused over the fullscreen game. With Cinnamon, the space for the panel is there, but not the panel itself. When you press Super, the menu pops up and shows the panel with it, but the panel isn’t usable…
There is an active issue on the cinnamon github from 2012. No one even knows if this should be a bug or a feature request, so it’s just all undefined behavior right now.
Edit: it’s even worse, a newer issue was closed last year after a discussion that can only be described as very linux.