It always works well for the upper layers that normal people view most of the time.
Once you dig in or start doing some stuff different than browsing or mailing, you see a crumbling basement, running miles below the nice surface.
For some days I've noticed I can't put anything on my start menu anymore. Can't move or delete anything from it either. I have restarted several times already because I was required to install updates, but it's still the same. This is what greatly annoys me. I can't be bothered anymore to look on the web for solutions, I just want to get rid of this POS that is windows.
Edit: Now that I'm ranting I may just as well continue. Yesterday I had to fresh install windows 10 on my girlfriend's pc because the hard drive crapped out after just about 2 years. I wanted to reinstall some of her most used apps, but it took hours. Why you might ask? Well, windows was constantly downloading and installing junk apps like candycrush, twitter, skype preview or W/E, sollitaire, 3d builder. I removed them over and over again, but they kept redownloading and reinstalling, taking all of our slow internet's bandwith and maxing the SSD write speed.
How happy she was when the laptop only costed 800€ proving me you can get a decent laptop for that kind of money. Oh boy, all the stuff I had to replace already. If you add that up, you have a laptop that's more than 1000€ already. And if you add my and her frustration, you have a priceless laptop.
Ugh I could go on for hours.