I've not had any serious problems with Win11 like system freeze-ups or bluescreens or anything of that nature. The only issues I've had are:
1) Some Windows updates look like they stop installing if you navigate away from the update screen or let the screen turn off, but they actually complete.
2) The sound/speaker icon in the system tray will sometimes say the audio's been muted when it hasn't.
3) The notification area keeps suggesting I adjust my Focus Assist settings when I already have it turned off.
Dumb stuff like that. I may actually go back to 10 for the time being until the first major update and see if things like the crap new Start menu, the crap new right-click menus, and issues like above have been addressed.