^^ It is only an attempt of innovation, but a bad one. Many things are barely functioning, and I had so much problems starting from the drivers .......until gaming. There are two many changes and while it is good to introduce something new, it is not strange that the sales of Windows 8 are so low. It is funny, but every second OS that Microsoft releases ends being a good one. So the successor of Windows 8 may be something that will be good, if this trend continues
Windows 7 is far more than a revamp of Vista. It has a lot of improvements both in the registry, the system and the hierarchy itself. Windows 7 is what Vista should've been. Windows Millennium looks like a revamp of Windows 98, but Windows 98 is at least 5 x better than Millennium, that is, btw, the worst OS that Microsoft ever released (and Win 8 will join him probably on this list).
It is up to you to decide, but I wouldn't put Windows 8 on my PC now even if they would pay me.