There was an interview with some U.S. army rep. that was pretty famous a few years back. He said that even if hackers broke in to the U.S. systems they wouldn't achieve anything due to how old, convoluted and buggy the systems were - even we who have full access can barely get anything to work!!

Of course, that was said purposefully, and may not reflect the truth at all.

But still, the thought that that is security for some (and I am sure it is for someone, somewhere) is kind of an extension of security by obscurity that is scary.