Poor battery life:
http://news.com.com/2100-1044_3-6181...0-20&subj=news

Slow moving/deleting/copying files:
http://www.theregister.co.uk/2007/03...a_copying_bug/


UAC was the biggest PITA in the beta versions I used at my old job. I hope at least some of the annoyances have been fixed in the public version:
http://www.flickr.com/photo_zoom.gne...1250154&size=o

Microsoft always makes some things harder to do with each new version of Windows. Seems like they try to make it easier to use the features that even an idiot will use. But the more advanced stuff gets buried deeper, and is harder to get to. It was the same with Windows 2000 to XP. But Vista is a much bigger change. Sure, there's a learning curve, and you'll get used to it. But getting used to it doesn't mean that it suddenly becomes a better OS.