For me and my family this is a great show as we race the cast to spot the common factor before they do. I have read the criticism above but then surely television is meant to be either a) entertaining or b) educational, ideally both. The show has excellent entertainment value, and any show that reminds us that just because we think we eradicated a disease there is no excuse to be complacent, nature can and will turn round and bite us in the rear if we do, or come up with something equally unpleasant.
It has been said that we cannot feel for the victims as we aren't given enough time to identify with them because they are only here for one episode. How many other shows especially crime or police based have the same situation ? The victim is a passing character the investigative team are the permanent stars, but no one seems to feel they are let down by this.
I am looking forward to when one of the team finally succumb to one of the illnesses they are fighting and the battle to save them, also to see which of the team pair up with who and how that will affect their working relationships.