It's a pretty good anti-terrorist novel, the rainbow six team would be nice to have during this time in history, but it doesn't have the same essence as clancy's previous novels.
A ripping good yarn based around a scarey what-if scenario. Good solid story with a good working knowledge of special operations (i.e. not too many goofs). Has a few plot dead ends that could be eliminated to reduce the bulk (800 odd pages) without detracting from the story at all. Ending is a bit tree-huggy and probably not that realistic.