This is a google trends graph comparing the terms "
xp problem" and "
vista problem"
What this graph says is that even though many many many more people use XP than vista, there are still more searches for vista problems. That means the
problem rate of Vista is astronomically higher than that of XP.
Additionally, my first hand experience with vista (as a developer, a user, and as tech support for Blockland users and my family) has been a nightmare.