I rather liked Vista aside from the firewall. I liked the start menu because of the active searchingas I type. I would complain about the UAC but I just turned it off lol, it didn't ask me to confirm anything afterwards. On top of this Aero may be a resource whore, but I'm running windows blinds anyways cuz I'm a sucker for a pretty desktop.
My only real problems are that the Nvidia drivers for it are buggy, the firewall sucked, and the new boot menu is setup different from all previous window's boot. So none of the commands work and finding the advanced boot options was a total pain.
Any upgrades of machines at my house will depend highly on the amount of work they have done by release time.
anyways just my mho