Well, it can be both good and bad. It always depends on how the technology is actually used. Remember that the Internet WAS DARPAnet originally (despite what Al Gore tells you). A lot of people will tell you the Internet is a great thing. Without it, we wouldn't be communicating here. But it is also open to privacy abuse.
This new DARPA initiative is a broad technology innovation push, much as DARPAnet was years ago. It can bring us marvelous new methods of information sharing and assimilation, as long as it is, as they say, used for good instead of evil.