Remaking one of the great films (not just horror) of all time is not a very good idea, and almost certainly was going to be met with resistance and negative feedback and groans of lack of imagination nowadays. But "Rosemary's Baby" does present some interest as a modern updated take on the original 60's set story.
How does the story and Rosemary's actions change in the modern world? What with the internet and cell phones and instant information, and maybe most importantly, a strong independent "modern" woman. The casting of Zoe Saldana as Rosemary, famous for her tough as nails action heroines she's been known to play, would seem to suggest this.
None of this means anything however. The movie does open with Rosemary chasing down a burglar, resulting in a cop calling her brave and reckless, suggesting he needs more cops like her. Yet this leads nowhere. Never again does Rosemary do anything rash or without someone's permission. If the movie were to suggest that her independence had been taken from her, then yes maybe that would be interesting but that's not what's here.
Instead we get a basic retread, expanded upon here and with some added gore there, with a fresh city that really amounts to nothing other than some French accents. Rosemary doesn't every really feel out of place here, except one time near the beginning when she suggest that she can't stay at a party because everyone is speaking French. But then everyone speaks English and that's that. Everything is plot contrivance without any new raison d'etre (I had to). Much like the recent wasted attempt at a "Carrie" remake...