I used Vista for a while; and whilst I realized that it was a Beta, there were some things that bugged me so much; I had to revert to using WinXP.
I shall elaborate:
The start menu; whilst it had a good idea in theory, having all the items in one pane, was no good from the perspective that I have way to much in my start menu; its far easier to look at it in the expanded WinXP/Legacy form.
The networking components and configuration utilities sucked. Is there a reason I should have to bounce betwean no less than 4 windows, to set up my WiFi? Network management was terrible in that regard, I think it would be far better if they scrapped all but the network managment tool, and if they showed the network view again so that I could see exactly what my network devices were doing.
Added to this, what happened to the 'Show icon in notification area when connected' option? WinVista NAT and DNSLT is not good enough for the network selection to happen automatically, I personally need to know what connection information is going out on! (I have 1 WiFi, and two Ethernet on my work comp, each to a diff network segment, i have to use NetSH to set them up manually)
Finally, managing permissions was too much of a pain; I'll grant that its fine if access is restricted, but give the user an easy and quick way to access permission sets, especially on folders; I shouldnt have to specially open explorer in root mode to do that, it should do that automatically like everything else. -> Sidenote1: Far too many security principles being fiven access, it confuses the issue. Sidenote2: It actually makes things worse that WinVista has all users by default in the 'users' group, if an admin wants to create an admin only share he has to create another group object and add everyone to it; this is reminding me of WinNT4... guch.