Bruce Schneier does have vast expertise when it comes to security/encryption and the fact that he is formulating his conclusions in a way that they can be consumed by the general public, is something that is commendable and makes him way more dangerous for the NSA. Which is one of the reaseons why he gets attacked for it, i guess.
Does he? What makes you think that? Can you be specific? I understand this to be an article of faith, but cryptography has changed significantly since the 1990s --- and software security has (a) changed even more and (b) been a pretty consistent weak spot in Schneier's analyses even in the '90s.
Flash I know to be insane. I don't use Firefox. So, less reason to care.
But yes, Schneier has become the USA Today of security advice. A lot of people read USA Today, so it's important, but it's probably not where you go for deep or substantial analysis. (and, generally a week after everyone else has discussed an issue to death)