I wouldn't go that far but I agree the instructions given out at most of them are not great, it makes it worse when people are talking and you can't hear things.
However as a boat owner and one who is responsible for the people on my boat to know what to do, where life jackets and other things are located I take each muster drill pretty seriously. I know exactly where our life jackets are in the cabin, I know how the go on and fit and I know exactly where our station is located. I bet 80% of passengers on any given cruise are clueless about all three