#4 - For some users, Windows 7 will mean more time spent setting up
Gone are applications such as Windows Mail, Windows Messenger, Movie Maker and so on. Anyone wanting apps of this sort will need to download then via Windows Live Essentials. Problem is, one person's trash is another person's treasure and if you use these apps Windows 7 means having to download and set up the apps that you need.
#5 - Search is odd
Why is it that when I search for say "Note" from the Start Menu I get Sticky Notes above Notepad? I've noticed countless such examples of strange behavior from the search system. Either it's not been fully refined yet, or there's some strange logic at work there.
#6 - Jump Lists are messy
Jump Lists is a new feature that Microsoft claims will give the user access to tasks related to specific applications. Depending on the applications, you get a different set of options in the Jump List, and that's a problem because there little consistency to what you can expect from a Jump List to make them useful.
The best thing about Jump Lists is that they are buried behind a right-click which means that most users will never see them!
Bonus Annoyance: System Explorer gone from Windows Defender
Why? This was the simplest, safest method users had to prevent applications running at boot time.