1. The (guest) lecturer sucked. His jokes aren't funny. It doesn't help when everyone laughs at him when he starts chuckling. He thinks we're laughing at the jokes, we're really laughing at the way he's talking. But he tries, and I'll give him credit for that.
2. While I understood all the material that's covered, I'm sure that students from other faculties did not. I think it's challenging to teach a "general" computer security module because it takes a lot of background knowledge in certain cases before you can truly appreciate/understand the topics covered. He was jumping from here to there and everywhere else in between.
3. He over-dramatised most of the security threats. Hollywood does that on a regular basis. While most of the things he said today were, in theory, technically possible, it would be incredibly difficult to pull it off in the real-world.
4. His assistant couldn't even demostrate a "script kiddie" level exploit properly. He did this thing where he stole some userids/passwords by simply inserting a thumbdrive. It's really very simple, Windows' Autorun feature will kick in and a script on the thumbdrive will run....and you know the rest. Once again, they over-dramatised the whole thing and probably made a few people fearful of inserting thumbdrives into their computers now.