Koroush Ghazi posted an article “Vista Annoyances Resolved,” in which he takes an objective view of Windows Vista from inception to its current state. Some of the “neat” stuff Koroush points out are pretty nice, especially the security enhancements in Windows Vista. There's been an ongoing debate whether or not it's actually better than XP. Koroush unearths some numbers:
In a comparison of Vista and XP security advisories issued by Microsoft between November 2006 and July 2008, Windows XP had 64 advisories rated Critical or Important, whereas Vista had 33 of the same type. Similarly, comparing the advisories issued by Secunia in 2008 Windows XP had 35% of its advisories rated Highly Critical or above, compared with Windows Vista's 29%. In fact as of late August 2008 XP still shows 30 unpatched security advisories, the highest one rated Moderately Critical; Vista shows 2 unpatched security advisories, the highest one rated Less Critical.
Source:→ Windows Vista Blog