I quickly browsed 100 tickets for win 10 in the software category and 43 had a windows update noted as cause or probable cause for the problem. It is of course fully unscientific, but if it is the same for the full range of tickets then that is almost 1.5 problems on average with windows update/computer/year.
(all titles below are approximate translations to English)
Several mentions of things like:
"Computer goes into loop on start after it had restarted itself for windows update" at least 4 of these
"Program X stops working" with a further comment that it had happened after windows update or version update. at least 5 of these with 2 being local file database corruption in some older program.
"Windows update never ends" At at least 3 of these
"Program X no longer works after new windows release" at least 3 of these.
"Printer settings lost after windows 10 version upgrade" at least 6 of these. All of these in the fall update.
(I say at least as I started counting when I noticed the same type of issue reoccur and it was a fairly quick scan so might have missed some of the same)
and the most fun one:
"Windows 10 constantly restarts the computer for updates every 10 minutes even if you tell it not to"