It always takes a couple of years for developers to prepare the next-gen OS for us users and even few more years to make the majority of them switch to it. Reason? For those first - it's money, for those second - it's another change. Not from yesterday we know that people usually don't like changes. Microsoft itself kept the simple interface of 'Windows' for over 2 decades and have gained a lot of fans despite BSOD's (Blue Screens of Death), compatibility problems, viruses, unlogical errors etc. General public could taste a lil' bit of Microsoft's new child on April 12, 2011. It was one of the first builds and unfortunately for Microsoft - it leaked to internet.
The wave of negative opinions began with the more stable Windows 8 that was released on September 13, 2011 (build 8102 - Windows 8 Developer Preview) and presented the majority of Metro UI.
I'll make a little pause in here and squeeze a tiny notice of mine - there's something strange going on with Microsoft from time to time. Let's start from the beginning - we have a Windows 98 in 1998 which repeated the success of Windows 95. Two years later we have Windows Millenium Edition which was a complete failure according to users. Then we have Windows XP which was a huge success of Microsoft. Successor of the Win XP was Vista which again was a huge failure. As you probably noticed - sinusoidal trend loves Microsoft Company.
Back to the subject - I have a feeling that Microsoft have made Windows 8 just to fill the 'hole' that appeared after introducing Apple's latest OS. Windows 8 seems to be a mix of unthought development actions and ideas invented in a rush. In one moment someone inside their company woke up and said 'dayumm guys this is hella unconvenient and illogical, what we do now?!'. Well... what would they do? Simple! Invest huge amounts of Woodrow Wilson's in the advertisment campaign and convince everyone that Windows 8 is exactly what they need in the times of economical crisis. Users get frustrated, Microsoft counts economic losses and the future of Windows 8 is unknown. Hundreds of people willing to pay even $125 just for a simple downgrade to Windows 7 doesn't seem to be good news for gigant from Redmond. Windows 8 seems to be another OS like Millenium or Vista which people will want to replace after first 30 minutes of using. Pretty sad cause we've started to believe that Redmond will serve us another Mac OS for half of the price.