Is it? They axed their internal QA and definitely aren't catching all the bugs with the "Insiders Program."

After the Fall Creator's Update I've had to log in twice (after the first one I just get sent back to the login screen).

The workaround is disabling a setting: "Use my sign-in info to automatically finish setting up my device after an update or restart."

I'm also getting repeated alerts that a restart is required to complete installing an audio driver, but restarting doesn't finish it. I probably need to track down the responsible driver, uninstall it, and reinstall manually or hope Windows does it.

Obviously that's not as serious an issue as unauthenticated root access, but in day-to-day use of my Windows computer I don't have a very positive impression of their software quality.