Saw Yesterday last week.
Setup was interesting (everyone but the performer didn't know anything about the Beatles) but felt the casting was not very good. Little chemistry between the two leads. And frankly the Beatles' songs get a bit tired after being played over and again (figure the licensing rights so expensive they could only include a handful in the film).
Wanted to like the film a lot more than I actually did. The director, Danny Boyle, made a couple of my favorite films, Slum Dog Millionaire and Trainspotting. This one I found boring. No one's perfect.
Others may disagree. My wife and cousin loved it.