I found Casa to be loud, ugly, and dirty. I think the name implies something of old Hollywood fame and glory, but in actuality it is not a nice place to visit.
There are far friendlier and more beautiful places in Morocco to spend your time in.
Its not really a city for tourism. Its a business hub with little charm. However, there are some great international-standard restaurants, and if it is summer time, its fun to frequent some of the beach clubs along the coast.
For shopping head to Morocco Mall for a modern , big, international centre. For more traditional products and ambiance visit the new Souq or Souq Habanous. Watch out for pick pockets. Taxis will rip you off too, but not as badly as in Marrakech! There isn't too much in the way of traditional architecture here; its a modern city.
Is a one of the nice cities in North Africa even is old design but very beautiful, worth to be visited.
After people telling us to not bother with casablanca and head straight to Marrakech, we were not expecting much.
Despite the recommendations we (my husband and I, both 27 from Australia) decided to stay for two nights and two full days on our arrival to morocco. We really enjoyed our stay here, visiting the central market for freshly shucked oysters, visiting the mosque (one of the few who allow no Muslims in), wandering the old medina and making the trip out to habbous - the new medina.
Casablanca is nothing like what you have in your imagination. It is a transit-town servicing more interesting parts of Morocco, and should be avoided all together if possible.
Even the remnant art-deco neighbourhoods had little charm to recommend them.
Some of the people are friendly. Perhaps it is the hardship that cause them to look rather solemn. Recommend when using the hammam to have a grommage (scrubbing).
They used the same scrub for everything from head to toe, so it is better to ask them to start off with the head first and toes last, or to use a different scrub.
There is not a lot to see and do in Casablanca, although the Hassan II mosque is worth a visit. If you are wandering through the old medina beware of a local who calls himself Sam and will approach you in a very friendly way offering to show you around for free but ultimately demands a large tip for his services.
I'm sure there are lots more like him in the medina.
I would not recommend a visit unless you had business there. It is really the business centre of Morocco and not a tourist destination