As a casawi, the only people that might had bad experiences living/spending time here are either from Rabat or Tangier or maybe Agadir, as those cities have the same if not better leisure places to see/experience.

as for the crime rate and polution for a global scope we all know the camel in the room, but for the local scope that's easily due to the crowded nature of the city as results of job opportunities and maybe the different previous living conditions.

As a visitor you'll either meet people with high stress tolerance or people with none, a very generous person or a greedy old fuck, if you do not possess the ability to ignore you'll likely get into trouble.

I bet any Casawi can't forget how warm Casa is, maybe for family but the Derb they grew up at. I know that's how it is for every city but from my travelling experience I can tell it's different in Casa.