because it doesn't randomly stuff itself, and it's generally faster.
My laptop has never crashed. Never. No errors, no blue screens. It's current up time right now is 186 hours. I've had it for half a year. As for speed, this machine does not lag when loading chrome, watching videos (with VLC), viewing pictures (with IfranViewer), or opening files (Windows Explorer). It obviously lags when gaming because it's a laptop and has Intel HD 3000. I haven't customized the desktop with anything except the taskbar's color which is default to 8. Blockland loads relativity fast even with a 5200RPM HDD. I don't know why people hate on Windows 8, the search function is so much faster than 7 it's laughable.
What is the benefit to a normal computer user?