I've been running Windows 10 on two test desktops since 10/1/14 (as an insider) and now an additional 4 desktops and a laptop, and haven't seen any problems with updates. I've been installing all the recommended Windows updates since Windows 98 came out with it and subsequent releases, and haven't personally seen any problems with any of them. If you spend a lot of time reading forum posts, you'll no doubt see a lot of strange problems reported but I'm convinced that's because there are a lot of folks tinkering around with things they don't understand and are greeted by Murphy.
One thing I've seen in a lot of cases is people who run these so-called registry cleaners. These things can delete entries that aren't currently used but MS put there for future use. Then when updates come along and try to use them, problems arise, and these people blame the updates (and not the registry cleaner that is the real cause of the problem).
Bottom line, don't worry about Windows updates - you may run into things that don't always work right, but the updates are the last thing I'd be worried about.
Good luck.