From PA: "I think it's best for the pax to just observe the briefing required. " ... even though it's being given by a new FA in unintelligible English on account of his/her native language being Serbo Croat to a load of passengers whose first flight this is an are too s**t scared to know what's going on.
With no real data to go on, I'd guess that on a typical low cost flight 10 - 20% are frequent fliers who've heard it all before and think they remember it all so don't listen; 10 - 20% are so out of their normal environment that they don't understand what's happening. This doesn't matter until things go wrong... but then you've got up to 40% of the pax who really don't know what to do. Is this acceptable?
Jim