I'm unsure why the bandwagon says that windows 8 is terrible, everything about windows 8 is really just windows 7 with a slap of well designed paint on it from my use so far, the compatibility is incredible and the flexibility is just fantastic. 'Metro' is a great addition to the OS, it gives you quick glance-able information quickly and the apps work as planned. Mail, messaging and calendar are especially helpful and with information being integrated in the lock screen it means I can do other things in the office and still see if there is anything important going on - you don't need a touch screen, mice/touch pads work great, just remember a couple of simple shortcuts.
for $50 for an upgrade to Win8 pro I gotta say that it is a steal.
Microsoft didn't make a mistake with this OS I don't think, they did something different
Windows 8 is simple when you want it to be, and very complex when you need it.