The worst scene in Baby Driver is at 4:30 in the opening of the film:
In written summary: 3 red cars go into a tunnel and when they come out the cops chase the wrong red car.
This tiny part of the chase is comically stupid, and belittles the police chasing Baby and crew, which makes Baby himself seem less impressive. This is undermining to the whole film!
Baby Driver however is still one of my faves of the year and has the best marketing so far too!