BonsaiK said:
Radioactive material is unneccesary when a sharp stick gets the same result for 1/100000th of the price.
I'd say "dirty bombs" are still very attractive for terrorists. You only need a small amount of radioactive material (which probably isn't that hard to get on the black market) and probably a lot less technical expertise. Sure it doesn't have the kaboom a proper nuke has, but the sole purpose of it ain't so much blowing something up but rather irradiating a certain area. Might not be enough to create The Zone or anything, but you bet your ass a huge area getting evacuated, quarantined and cleaned by scary people in hazmat suits is going to make an impression.
As for the rest, yeah, you're right, they're pretty worthless nowadays.