At the Windows Vista Team Blog, Jim Allchin, the Chief of Microsoft’s Vista development effort and long-time Microsoft employee, soon to retire after having completed Vista at last, has advised readers that Windows Vista has more drivers built-in at launch than any previous version Windows. Allchin tells us that since Vista went RTM, an addition 11,700 drivers are now ready and waiting for you if you add a new peripheral to your computer, although you should naturally always try loading the drivers that came with your new hardware from CD first.
Source: itwire.com.au
Obviously microsoft wants to avoid the chaos which happened with the win xp debut. My honest opinion is that the fault is ours. We first check for official drivers from the manufacturers and then we install a new OS.