After reading through some of the reviews here on IMDB, I could quickly surmise the people who didn't enjoy The Good Nurse had the movie being "plain" and "boring" as their main gripes. Granted, the film is slow with very little flash, but since when has this become a bad thing? The ADHD generation needs quick cutting and seizure inducing visuals to keep their attention, and this is the complete opposite.
The Good Nurse works because of a number of factors. A tight script with a consistent beat, never wavering or faltering, which keeps us going at a slow but deliberate pace through the story. The acting is excellent, with Eddie Raymayne and Jessica Chastain absolutely killing their respective roles. The camera work is creative and engaging, choosing to hold shots for long periods while keeping the focus on the heroes of the story. But probably most of all, this movie works because it very (seemingly) accurately portrays the events and people involved without needing to inject needless Hollywood drama.
Netflix has a reputation for producing movies ranging from mediocre to downright terrible, but this one is not one of either.