Casablanca is a large and modern city, where, once, someone made a film that, for reasons that I couldn't really understand in the 97 times that I saw it, became very famous.
If you are thinking in the film scenery, you may find a reconstructed bar, an area they say that it was in the movie, and... that's it. If you want to meet Morocco, then the best you have is the airport and railway station.
But if you appreciate big and busy cities, then that's your place. And here and there, the real Morocco comes to surface.