In normal operation over the last 3 years, I've had a vanishly small amount of trouble with Windows. Why? Developers can no longer replace system DLLs at will.
Does this mean Windows is suddenly the best OS ever? Of course not - it's still mostly a tangled spaghetti of impossibly complex dependencies, but at least it's now "as good as possible" given that it's Windows. I have essentially no problems with Windows of any kind, other than the occasional need to restart Explorer. I haven't had a blue screen in recent memory. I haven't lost any work. In fact the only really serious computer problem I've encountered in years happened when XFree destroyed my display.