I like Windows 8 but feel its more of a Windows 7 skin for tablet devices, and brings very little to the general desktop & laptop devices. In fact in those instances, some of it's mechanics are a little more cumbersome to quickly adjust.
Dragging with a mouse, items which are clearly meant to be dragged directly via touch just somehow feels wrong / alien.
Also simple things like powering down your machine now takes longer (having to sign out and then press power rather than just hit start and power).
Windows 8 is not a VISTA as it's built on a more solid Windows 7 foundation, but it certainly is going to be VERY divisive.
For many desktop and laptop owners, I imagine there will come a point where they may prefer to turn the new windows shell off and return to more familiar territory albeit with access to marketplace and such, however this is not an option with Windows 8 currently...
Just wanna clear this up that the foundation is from Vista. Windows 7 is 99% the same for the most part. Contrary to what most people think Vista was a large step in the right direction. The problem was that it had a new driver module and manufacturers lagged behind in getting drivers made. After a few months these issues were fixed but the damage was done and it got a bad reputation hence why windows 7 came so quickly afterwards. Windows 7 used the same driver module which is why it already had a mature driver pool. Another thing that microsoft did later on in vista and during windows 7 was make stricter requirement on how much bloatware was preinstalled on certified machines.