I just don't think Vista was ready for a release, neither was it updated often enough to be a good OS. I think that people who have the knowledge to customize their system, it can be a very good operating system, however the standard delivery is just a plain downgrade compared to XP.
I don't really care it sucked in the beginning, because that's how development works. If they get thousands of the same complain, they just update the OS to get rid of the problems. However, they now make a new OS wich proberly means they'll just leave vista for what it is, wich isn't nearly what is should have been.