Have to concur with Grandpa Aerotart on this one, soooo often you hear a wrote briefing, and all you try to do is avoid going to zzzzzz, and try to look mostly interested.
IMHO, the concept is far more threat management..i.e. whats got the potential to kill us today?
Anymore indepth for the other stuff just gets lost in the white noise.
Of course however, given that I probably fly with the same guy once every 3 years or so, it is important to establish that you are on the same page....mostly we are