Think about it. It’s true the most exciting part of most is the first third when the relevant characters are introduced It’s the part when your imagination can take the movie in any direction and it sets you up to be surprised when it takes a turn, or if you are a movie dissector then it marks the time when you start making your predictions.
I have an amazing way of allowing myself to fall into a movie. I get a lot of enjoyment even from poor movies. I guess it’s just the love of a story.
One of the best examples of good introduction of characters is the Arnold Swarzeneggers classic “predator”. A great film for its time but what really stands out is the introduction of it’s characters. So good, so so good
Another film which gets off to a good start was Magnum PI’s Squiggly down under
Or think about Reservoir doggies
There are endless examples of it. these are some of my favs