Thurrott to Microsoft: Delay Vista!
http://www.winsupersite.com/showcase/winvista_ready.aspMany of the points he complains about are how Windows has regressed in terms of application compatibility, from Adobe issues to ActiveX controls on web pages. Probably the best though are the cut and paste COM errors he gets with the Office 2007 beta (since the two are supposedly "Better Together" according to Microsoft). Then there's any number of usability complaints over how it seems to defy common logic, or previous versions of Windows.
In short, not only is his answer to "Is Vista ready?" a solid "No", it's a resounding "No. God, no"
Be sure to check out the rant, in all of it's glory, in the link below.