Marseille is one of the best places to try seafood in France
I have heard that as well. The little that I had was good.
I haven't seen that show. Nice might have some bad areas like any major city but I didn't get the same vibes as I did with Marseille. I'd say you could skip Marseille and not really miss out on anything. There are much better places in Provence and much better along the Riviera.
Will definitely keep that in mind and if for some reason I land there, will keep my guards up. We really enjoyed the show, lots of plot twists.