My top 4 favourite criticisms of Windows 8:
1) "So what if Microsoft have a 90% market share? That doesn't mean that Windows is any good. Just because people buy something doesn't mean that it's good. Linux and Mac OS are much better yet they have a tiny market share -- you can't tell from market share whether a product is good or not."
2) "You can tell how crap Windows 8 is, because Microsoft are losing market share. People just aren't buying Windows 8. People aren't even buying new PCs, because they all come with Windows 8 on them! That's how crap Windows 8 is."
3) "Microsoft may be dominant on PCs but in the new markets of mobile, tablets, and other small form factors, they have a tiny fraction of the market. This is a much more significant statistic because the future lies in mobile technology and devices. Windows 8 is completely irrelevant because Microsoft simply won't exist in 2 or 3 years time, when all consumer devices are small, low-power, mobile devices with touch-screen interfaces. Microsoft may be dominant on PCs but the mobile market is the most important. Microsoft and Windows 8 are irrelevant on mobile."
4) "Microsoft's OS sucks for desktops. They've made an OS that can be used on touch-screens, but they should be making an OS designed specifically for desktops. Microsoft should ignore touch-screens and tablets and only focus on desktops. What's the point in developing an OS that can run on touch-screens? I have a desktop."