The unsilent minority
I know a lot of people with Vista. And while a few of them don't like it (just a dislike of change more than anything), none of the manyfold 'problems' have cropped up - with the exception of the stupid copying time problem.
Perhaps the people, I know are just extraordinary, but they did stupid things when the bought Vista, like check if their hardware was compatble and if drivers were available for peripherals they had...
Every OS has its bluescreen moments (and yes, even linux -- I've run at least one linux box in some form or another for the last 14 years, ah slackware, I hated you so much!) And windows has more of them than most. But lets face, find another OS with as much driver support as windows, and drivers are the real culprit for most instability. Probably percentage-wise there's not much difference, but incident-wise, obviosuly Windows appears to have more.
Blame MS for a bad driver model by all means, but quit the 'I have problems so Vista is crud' comments.