I thought Murder is Easy had been done before, not so many years ago. At the beginning I knew it was a plain woman living in a cottage who was the murderer. The actress who played the part before was creepy and far more convincing.
Actually, I thought it was pretty awful. I too have no problem with a Nigerian playing the investigator but I thought the young man was miscast - and his clothing didn't seem in keeping with the times.
The woman who played the murderer was, in my opinion, miscast also - thought I thought the whole thing was really hammy and totally unconvincing. Why did I continue to watch? Goodness only knows.
I watched Witness for the Prosecution. Of course, I have seen it before, but still marvel at Marlene Deitrich's dreadful cockney accent. For its time, though, I thought it was pretty good, though the barrister's screaming at his nurse would not, I think, be thought amusing these days.
I too think it is usually a mistake to try and contemporise old stories. Agatha Christie was a genius with plotting but the plots don't really lend themselves to modern life. As someone else said, it would, in my opinion, be better to commission more up-to-date writers to produce up-to- date material that reflect modern life.