What does this say about audiences?

From the top left of poster for the original Manchurian Candidate, before even Frank Sinatra's name:

You must not miss the first five minutes to know what it's all about!

Erm... I know I can be like Woody Allen in Annie Hall, declining to go into a film he's seen before because he would have missed two seconds of the opening text-only credits (and nothing else) but...