I wish there was more THERE there.
I suppose one could try to discuss an immigrant's assessment of America, of American culture, morality, race relations, and popular culture set against the backdrop of modern-day Atlanta. However, that would be REALLY REACHING. This is about the zip zip and not much more.
One of the things I have always liked about Edgar Wright's work is the deeper subtext of story. So to deliver something that is all slick surface... it just doesn't meet expectations.