Cluster bombs’ are generally a bigger threat vs people. (ex: football stadium) Bunker busters are more useful vs. hardened structures. (Command center)
I have heard a suggestion that the world trade center would have likely survived a hit from a Father of all Bombs. Though the building would likely need to be condemned afterward.
PS: Aparently they are vary useful for cave systems though.
Because clearly explosives or pointy sticks are just as bad as nuclear or biological weapons. </sarcasm>
PS: I thougt about saying heavy or fast, but that can still be scary. http://en.wikipedia.org/wiki/Kinetic_bombardment