I use Windows 8, and I actually like it.
The Previews were indeed bad, but most of it is fixed in the actual release.
Most of the time, you want to choose Windows 8 for the Metro Apps, Xbox 360 compatibility, Windows Tablets, having an MS Ecosystem, or you simply like to have the latest of the latest.
However, you might want to check, if all of your Apps, Games, and/or Drivers are compatible with Windows 8.
If not, then Windows 7 still has enough years of support.