I don't know that many actors, even those auditioning a lot, get to read many full scripts. I have read a few for auditions, but I've probably read more from friends.
I also was a paid reader on two, years ago.
What do people look for? The simplest answer is probably something fresh. Which of course is hard to define.
A producer with some money to back up their opinion may be looking more specifically for:
- a script that is "like" a recent hit
- a script that has a good role for a particular (usually well-known) actor
- a script that doesn't include all kinds of additional expense (period, sci-fi, etc.)
But even that will vary.
The other thing, and this is surprisingly hard to find, is a script with nothing blatantly wrong with it. I've read scripts that repeated information, that had no obvious plot, that depended on frankly erroneous stereotypes, etc.
I helped with a reading of one script that was a hodgepodge of all kinds of action sequences, some of which were fun, except for one thing: no character appeared as the protagonist. When I asked the writer "whose story is this?", he couldn't answer.
How do you go to an agent and say, "I've got a film for your star?" if you can't point to a role that makes it their movie?
So before showing any script who counts, it's important to show it to enough people who will warn you of the missing pieces you may not even thing about.
But as for exciting people, it is almost by definition indefinable. "Juno" probably caught people's eyes by the language and the endearing main character. I never got either "Lost in Translation" or "Little Miss Sunshine", but again the slight quirkiness of the characters probably was key. "The Diving Bell and the Butterfly" not only involves a striking situation, but brings unexpected humor to a tragic situation.
Did "Titanic" even have a script, really?
You might think about the films YOU'VE been excited about - not just like, but really were touched by - and list all the things in it that made that so.
But really the core elements are indefinable. One thing you do hear a lot from writers is that the worst thing you can do is to try and write what you think other people will like. The best thing is to find your own truest preoccupations and work from there.