If you make a movie that is almost entirely a cabbie talking to a fare as they drive from the airport to her apartment, your characters had better be enthralling. Dakota Johnson is right in her lane: guarded and aloof at first, and gradually exposing herself. Sean Penn is a little too far into the “Hey, I’m a New Yawk cabbie here! How ’bout dat?” mode. Also, he’s Sean Penn.
Also, if you’re planning to see this: it’s all talk, there are no dramatic special effects, and 99% of it is inside the cab, so there’s no burning need to see it in a theater.