One in particular had a few problems, some of which were easily fixed, but what really stood out was how it committed a cardinal sin of screenwriting by having a lot of scenes where the characters talk repeatedly about something “important” they want to do, but by the end, they end up not doing anything. And I mean that literally. These were some of the most passive characters I’ve experienced.
It didn’t help that the characters also had no arc. They were exactly the same from beginning to end (with maybe the exception of one who might have been arrested, but even the circumstances involved with that are still somewhat unclear).
Let’s face it. A main character who’s all talk, no action, and doesn’t change is the death knell for your script. Why would somebody be interested in seeing what happens to them, especially if they don’t do anything?
One of the most frequent problems I’ve seen is when the main character isn’t the one driving the story forward. They just kind of hang around and watch stuff happen.
Bo. Ring.
Remember, you’re trying to get your main character to their goal over the course of the story. They have to be the one making things happen in order to achieve that, or at least react to what happens in such a way that it helps them. The way these characters were written, I honestly had no idea what their individual goals were.
Take a look at your latest draft. Which character is moving the story forward? Is your main character active or passive? Are they making things happen? If not, can you see what you’d need to change in order to do that?
You definitely want your characters to come across as believably three-dimensional. Having them do little or next-to-nothing throughout the story is doing you no favors. Character motivation and actions are some of those key elements that simply cannot be left out. Audiences can forgive certain things, but a dull, passive main character isn’t one of them.
Maximum Z 
Working with a passive protagonist is like driving on ice. No traction, no motion. Another character must rise to the occasion and power the story or it’s over.
Yes, movies demand action. I always thought “My Dinner with Andre” would have worked better if they had a car chase scene where they talked over headphones as they raced around Manhattan.
Yeah, that or a camel race. Anything to prevent static shots.
One of my screenwriting books said something like : If you want 2-3 people sitting around talking, write a play. If you want your characters constantly having internal thoughts about what’s happening, write a novel. Otherwise, write a screenplay. I do like “My Dinner with Andre” but, yes, it was a play.