The complains about the Windows 8 preview maybe put down by some, as resistance to change. Certainly for myself this is not the case. I like change, or more accurately progress. I am happy for Microsoft to shake up the GUI in Windows in new releases. It's why I brought Vista early on, as despite the bugs the Aero interface with task bar thumbnail previews was progress. It made the experience to me more streamlined. That is what progress means to me.
After playing with the Windows 8 preview I have come to the conclusion that the changes are not progress. In fact for mouse and keyboard users the new setup is a step backwards. I now have to make extra clicks or wait longer to be able to do the things I normally do in Windows 7. This to me is not progress and therefore it is legitimate to be critical.
Don't get me wrong Metro seems like an interface with lots of potential, but on touch devices (as others have already said). With a mouse and keyboard, what's the opposite of streamlined?
It is a shame they cannot find a GUI that works in a streamlined way with both touch, mouse and keyboard.
The final issue for this version is that apart from Metro if you have a touch device, I see no killer reason to upgrade. At least Vista had Aero and DirectX 10 for gamers. What has Win 8 got apart from an interface most of the current install base are not interested in because they use mouse and keyboard.
Also you may say, 'well Microsoft are being clever becuase they know mouse and keyboard is on the way out and touch will be the prefered input method'. I have to disagree. I have used touch devices and always find the exprience better with mouse and keyboard. Touch is great for mobile while you are on the go, but as soon as you are not on the go, nothing beats the mouse and keyboard for input accuracy and speed. This control method is going nowhere and Microsoft devalue it, at their peril.