I've known my desktop's windows install has been messed up for awhile now, it's been having some issues, it's never successfully been able to install updates, it always failed during the restart and would just come back to build 10240 after every update saying an update failed and to try again.
Windows store wouldn't allow me to download and install any new apps (but old apps that came preinstalled could be uninstalled and redownloaded without issue).
Afterall awhile the "settings" menu just stopped opening. The Control panel still worked, but going to the windows icon and then the gear cog icon would pop a window open and then close immediately.
Finally got tired of it the other evening and with Destiny 2 launching I figured it was probably time to fix my windows install. I first attempted to install while keeping all the files and documents, but that failed (it claimed) due to the original windows install not being in the correct directory (which wasn't true from what I could tell).
But in the end I went ahead on a fresh install and just wipe everything, I had backups for pictures and documents so I was only really losing the time it would take to redownload and install some programs.
I was also pleasantly surprised to see microsoft servers able to handle my internet speeds, I peaked at 109MB/s but it was steady 102-105MB/s for a good 2-3 minutes.
Overall experience with the fall creators update has been positive. Though coming from a fairly corrupted install of windows 10 originally, i'm not sure if it's a great comparison.